Many exercise videos will make unrealistic guarantees in terms of the results you can expect to see. Beware of these because they can set you up for a real disappointment. A good example of this is a program that claims you can get “ripped” in 30 days. Well, this might be true IF you are only toning up and don’t have weight to lose. For anyone who has got pounds to lose, they finish the 30 days and are still not “ripped” because those claims did not apply to anyone who has weight to lose.

Rock climbing is one of the most physically challenging sports, testing strength, endurance, flexibility, and stamina. Good climbers have to build and maintain each of these assets. This is revised and updated edition of the classic book, Conditioning for Climbers, provides climbers of all ages and experience with the knowledge and tools to design and follow a comprehensive, personalized exercise program.

Other strength training equipment. This includes weight stacks (plates with cables and pulleys), flexible bands, and flexible rods. Fichera says flexible bands are good for beginners, especially since they come with instructions. But he doesn't recommend them for long-term use; your muscles will likely adapt to the resistance and need more of a challenge.

All data are presented as means ± standard deviation (SD) unless stated. Assumptions of statistical tests such as normal distribution and sphericity of data were checked as appropriate. Greenhouse-Geisser correction to the degrees of freedom was applied when violations to sphericity were present. For reliability statistics, assumptions of homoscedasticity and heteroscedasticity were checked as appropriate. Reliability analysis was conducted following the guidelines provided by Atkinson and Nevill [19]. Our sample size of eight subjects is comparable to previous studies using high-intensity OLDE [8, 11, 17].
Yoga is appropriate for individuals of all ages and fitness levels. Those who are seeking a workout that increases their mind, body and spiritual awareness will find yoga to be a good fit for them. Those who wish to increase their fitness level at a slower pace may find that yoga is perfect for them, although the physical intensity is just as high as in many other exercise methods. Yoga exercises utilize a variety of muscle groups at the same time, so an entire body workout is often achieved during each class. Yoga is effective in toning muscles without creating a bulky look.
Publications, establishment recognition, and public support followed the success. In 1932, Fairbairn was elected President of the Royal College of Obstetricians and Gynecologists.31 Fairbairn JS. Obituary. BJOG: An International Journal of Obstetrics and Gynaecology. 1944;51:152–6.10.1111/bjo.1944.51.issue-2[Crossref] [Google Scholar] In 1936, Morris (in collaboration with Randell) published ‘Maternity and Post-Operative Exercises,’ that illustrated exercises for pregnant and puerperal women and those who had been operated on. The book emphasized breathing, relaxation, conscious training of the pelvic floor muscles, and re-establishing good posture.32 Morris M. Maternity and post-operative exercises. London: Heinemann; 1936. [Google Scholar] A year later, Morris published ‘Basic Physical Training’ for the general public, dedicated to ‘all those who, realising the inter-dependence of mental and physical well-being, are working to raise the standard of health.’33 Morris M. Basic physical training. London: Heinemann; 1937. [Google Scholar] In 1939, Randell published her seminal textbook ‘Training for Childbirth - From the Mothers Point of View’ which described her philosophy in detail with related anatomy and pathology and exercise descriptions and instructions.25 Randell M. Training for childbirth from a mother's point of view. 4th ed. London: J. & A. Churchill Ltd.; 1949. [Google Scholar] This was followed up in 1949 with ‘Fearless Childbirth’, a practical manual for mothers-to-be.34 Randell M. Fearless childhood. London: J. & A. Churchill Ltd.; 1953. [Google Scholar]

^ Jump up to: a b Kyu, Hmwe H; Bachman, Victoria F; Alexander, Lily T; Mumford, John Everett; Afshin, Ashkan; Estep, Kara; Veerman, J Lennert; Delwiche, Kristen; Iannarone, Marissa L; Moyer, Madeline L; Cercy, Kelly; Vos, Theo; Murray, Christopher J L; Forouzanfar, Mohammad H (9 August 2016). "Physical activity and risk of breast cancer, colon cancer, diabetes, ischemic heart disease, and ischemic stroke events: systematic review and dose-response meta-analysis for the Global Burden of Disease Study 2013". BMJ. 354: i3857. doi:10.1136/bmj.i3857. PMC 4979358. PMID 27510511.
Go online for more information, recommends certified personal trainer Paula Zurowski. Web sites like or Zurowski's offer detailed descriptions and ratings of fitness videos. Collage even offers a one-minute clip of most videos, so you can get a feel for the level of the workout and whether you're going to like the instructor.
Jump up ^ Olsen CM (December 2011). "Natural rewards, neuroplasticity, and non-drug addictions". Neuropharmacology. 61 (7): 1109–1122. doi:10.1016/j.neuropharm.2011.03.010. PMC 3139704. PMID 21459101. Similar to environmental enrichment, studies have found that exercise reduces self-administration and relapse to drugs of abuse (Cosgrove et al., 2002; Zlebnik et al., 2010). There is also some evidence that these preclinical findings translate to human populations, as exercise reduces withdrawal symptoms and relapse in abstinent smokers (Daniel et al., 2006; Prochaska et al., 2008), and one drug recovery program has seen success in participants that train for and compete in a marathon as part of the program (Butler, 2005). ... In humans, the role of dopamine signaling in incentive-sensitization processes has recently been highlighted by the observation of a dopamine dysregulation syndrome in some patients taking dopaminergic drugs. This syndrome is characterized by a medication-induced increase in (or compulsive) engagement in non-drug rewards such as gambling, shopping, or sex (Evans et al., 2006; Aiken, 2007; Lader, 2008).
Mix-and-match interval training works magic in Natalie Jill's Rev4 Rev It Up. The four 10-minute routines hit different trouble zones so you can do them as stand-alones—"I definitely felt I got a good workout after each," one tester said—or combine them for a total-body session. Testers loved that they could "switch things up for time-pressed mornings" and gave props to instructor Jill's "nice energy." Expect a variety of planks and booty-shaping moves.
Jump up ^ Silverman MN, Deuster PA (October 2014). "Biological mechanisms underlying the role of physical fitness in health and resilience". Interface Focus. 4 (5): 20140040. doi:10.1098/rsfs.2014.0040. PMC 4142018. PMID 25285199. Importantly, physical exercise can improve growth factor signalling directly or indirectly by reducing pro-inflammatory signalling [33]. Exercise-induced increases in brain monoamines (norepinephrine and serotonin) may also contribute to increased expression of hippocampal BDNF [194]. In addition, other growth factors—insulin-like growth factor-1 (IGF-1) and vascular endothelial growth factor—have been shown to play an important role in BDNF-induced effects on neuroplasticity [33,172,190,192], as well as exerting neuroprotective effects of their own [33,214,215], thereby contributing to the beneficial effects of exercise on brain health.
Georgi A. A biographical sketch of the Swedish poet and gymnasiarch, P.H. Ling. London: H. Bailliere; 1854.  Ling founded the Royal Gymnastic Central Institute in Stockholm in 1822, was an elected member of the Swedish General Medical Association, member of the Swedish Academy, and a Titular Professor. However, Ling remained indifferent to these honors due to the lack of the establishment’s implementation of his methods.7 Georgi A. A biographical sketch of the Swedish poet and gymnasiarch, P.H. Ling. London: H. Bailliere; 1854. [Google Scholar]
Congratulations on your decision to make yourself a priority and commit to a regular workout routine. The addition of physical fitness into your life requires hard work, but yields great rewards. Now, which method should you choose? With the vast choice of fitness workout options available today, it can be overwhelming to know which one is right for you.
Dancer, choreographer, stunt woman and fitness expert Kelly Connolly says you can shrink your waist in 30 seconds a day with “salsa swivels.” “It’s no secret that dancing is a great way to trim down and tone without even realizing you’re exercising,” she says. “The high energy and twisting motions of Salsa dancing can have a significant impact on your body while giving you some new moves to take to the dance floor.”
You acquire 100 new shares, giving you a total of 160. You simultaneously sell 50 shares of the exercised options to pay the total exercise cost ($2,000 ÷ $40 = 50 shares), leaving you with 110. Additional shares must be sold to pay for broker fees and, if exercising NQSOs, withholding taxes. After the exercise, you might own less than the 110 shares.
Tori is a dancer from Los Angeles, and she incorporates all of the dance moves she uses regularly in a super fun and high-energy workout. As she explains, you don’t need to be a dancer to take her classes. In just five minutes, Tori manages to work your booty, core, arms, and legs. A great intro workout, this low-impact routine requires no equipment — just an empty space — and will be sure to warm you up.

"Exercise is the magic pill," says Michael R. Bracko, EdD, FACSM, chairman of the American College of Sports Medicine's Consumer Information Committee. "Exercise can literally cure diseases like some forms of heart disease. Exercise has been implicated in helping people prevent or recover from some forms of cancer. Exercise helps people with arthritis. Exercise helps people prevent and reverse depression."
Alert: Companies strictly follow their exercise rules and deadlines, and courts tend to side with them. See, for example, Deal v. Consumer Programs, Inc. (2006), decided by the 8th Circuit Court of Appeals. The court ruled that the mere submission of a written notice to exercise stock options may be insufficient when the grant agreement states that the notice must be "accompanied by full payment of the purchase price of the shares."
Founder Ken Hutchins' SuperSlow has been 'managed' by unscrupulous business partners, into a commercial entity bearing little resemblance to his original intention, (& no involvement with Mr Hutchins himself, nor any of his original associates). The -real- SS was revolutionary for its time, but Hutchins' new textbook, "The Renaissance of Exercise, a Vitruvian Adventure", is the result of his ongoing refinements over the past 18 years. Rather than pay over a $150 for the supposed historic value of a slim, soft-cover, dog-eared $10 book & it's relatively primitive ideas, get the new hard-cover textbook./It seems that one of the main criticisms os The Manual is "too much information". True, for a casual reader.The fact is, ANY exercise protocol is simple enough to write up on one or two pages: How many sets. How many reps. How many exercises. How often. About 10 exercise technique descriptions: Done. It's the precise whys, hows, & special cases that take a book to fulfill.
Bottom line. Muscle confusion is a snappy term for non-linear periodization, which simply means rotating the workouts you do so that your muscles are constantly challenged and you get better, faster toning and weight-loss results. Research suggests this approach is more effective than doing the same exercise routine. P90X is a 90-day plan that combines strength moves, cardio, and yoga­—and if you follow it faithfully, you will probably see results. But it’s suitable only for those who are already very fit because the routines are intense and take about an hour a day. Note: You’ll also need dumbbells, exercise bands, and a pull-up bar, which do not come with the basic system. The diet is complicated, but it provides an appropriate number of calories for the work you’ll be doing.
The findings indicated that exercise improves outcomes of pain, strength, ROM impairments, and function in patients with impingement syndrome. In 10 studies, investigators reported improvements in pain with supervised exercise, home exercise, exercise associated with manual therapy, and exercise after subacromial decompression. Of the 6 studies in which researchers compared pre-exercise pain with postexercise pain, 5 demonstrated that exercise produced statistically significant and clinically important reductions in pain. Two studies demonstrated improvements in pain when comparing exercise and control groups. In 1 study, investigators evaluated bracing without exercise and found no difference in pain between the brace and exercise groups. Investigators evaluated exercise combined with manual therapy in 3 studies and demonstrated improvement in pain relief in each study and improvement in strength in 1 study. In most studies, exercise also was shown to improve function. The improvement in function was statistically significant in 4 studies and clinically meaningful in 2 of these studies. In 2 studies, researchers compared supervised exercise with a home exercise program and found that function improved in both groups but was not different between groups. This finding might have resulted from a type II statistical error. In 4 studies, researchers did not find differences between acromioplasty with exercise and exercise alone for pain alone or for outcomes of pain and function.
We have included step by step instructional guides for over 500 different resistance training exercises. This database covers a wide variety of different exercises including free weights, CrossFit, kettlebells, machines, bodyweight, medicine ball, elastic bands, exercise ball, Pilates and stretching movements. Choose from a list for a specific muscle group or select by exercise type to pick the best exercises for your workout. Each instructional page will show you how to properly perform a resistance training exercise with detailed photos and exercise advice for each movement. It’s like having your very own personal trainer. These exercise guides will help set you on the right track so you can get in the best shape of your life!
So what's so special about tendon problems and eccentric exercise? It seems that eccentric exercise seems to be helpful to injured tendons. Why? Researchers still do not know why this type of exercise is special. Still, if you have a tendon injury, like Achilees tendonitis, your physical therapist may have you perform eccentric exercises to help treat your condition.

Investigations were identified by PubMed, Ovid, the Cochrane Central Register of Controlled Trials, Cochrane Database of Systematic Reviews, American College of Physicians Journal Club, and Database of Abstracts of Reviews of Effects. The search terms included shoulder, impingement, rotator cuff, rehabilitation, physical therapy, physiotherapy, and exercise. Additional searches were performed with bibliographies of retrieved studies.

Degenhardt B [Internet]. Once upon a time: the evolution of Pilates mat work. 2012 Nov 21 [cited 2015 Aug 30]. Available from:  He was later moved to the Isle of Man where he had duties training the injured inmates in their wards. It was there that Pilates started to connect springs to the hospital bed frames modifying them into effective and comfortable exercise devices which later evolved to become modern Pilates equipment.43 Hessel J [Internet]. Joseph H. Pilates biography. 2015 Jul 8 [cited 2015 Aug 30]. Available from: [Google Scholar]
To qualify for inclusion, studies had to be level 1 or level 2 (randomized controlled trials); had to compare rehabilitation interventions, such as exercise or manual therapy, with other treatments or placebo; had to include validated outcome measures of pain, function, or disability; and had to be limited to individuals with diagnosed impingement syndrome. Impingement syndrome was determined by a positive impingement sign per Neer or Hawkins criteria, or both. Articles were excluded if they addressed other shoulder conditions (eg, calcific tendinosis, full-thickness rotator cuff tears, adhesive capsulitis, osteoarthritis), addressed postoperative management, were retrospective studies or case series, or used other outcome measures.
Neuromuscular function tests were performed pre and post-exercise to quantify muscle fatigue. As previous studies documented the extent of isometric muscle fatigue induced by OLDE [8, 11, 17, 18], we chose to focus only on isokinetic muscle fatigue. Therefore, knee extensors (KE) MVCs were performed at 60 (MVC60), 100 (MVC100) and 140 (MVC140) deg/s pre (after the warm-up) and post-exercise (13 ± 4s after exhaustion). Subjects were asked to perform two maximal isokinetic knee extensions at each angular velocity (starting position corresponded to knee angle at 90 deg; range of motion was the same as the OLDE). The highest peak torque value of the two trials was considered, and a 20 s recovery was set between each set of KE MVCs. The order of contractions was randomized between sessions as follow (60-100-140 deg/s, 100-140-60 deg/s or 140-60-100 deg/s) and identical for testing pre and post-exercise of the same session. This randomization allows obtaining a time course of KE MVC torque recovery following the time to exhaustion test at each angular velocity was obtained at a different time point at each session: either shortly after exhaustion (13 ± 4 s after exhaustion), 20 s following exhaustion test (P20) and 40 s following exhaustion test (P40). An overview of timing can be found in Fig 1. Twenty seconds after completion of the last KE MVC, a maximal isometric MVC of the knee flexors was performed (isometric KF MVC). Visual feedback of the torque and strong verbal encouragement were provided for each MVC [please see reference 9 for more details].

This program isn’t just for the true beginner who has never touched a weight before; it’s also suitable for anyone who has taken an extended leave of absence from training. How long has it been since you went to the gym regularly? Six months? A year? Five years? No worries: The following routines will get you back on track in—you guessed it—just four short weeks. Let’s get to work.

Congratulations on your decision to make yourself a priority and commit to a regular workout routine. The addition of physical fitness into your life requires hard work, but yields great rewards. Now, which method should you choose? With the vast choice of fitness workout options available today, it can be overwhelming to know which one is right for you.

The Alfredson protocol should be continued for 12 weeks to see optimal results.  During that time, you may wish to consult with a physical therapist who can offer advice on when to return to normal activities, such as running.  Your physical therapist can prescribe balance exercises with a BAPS board and plyometric exercises to ensure that you will be able to run and jump without suffering a re-injury to your Achilles' tendon.
"You will never get bored," said one tester, with the push-yourself workouts in the 21 Day Fix—seven 30-minute sessions ranging from high-intensity cardio-strength circuits to Pilates. Each routine "amps up familiar moves" to crank your calorie burn. Another tester was wowed that "so many different modifications and options were shown to help me switch up my workout." There's an included diet plan for those on a mission to trim.
* After you reach your peak of development, you lose muscle tissue every day up until your death. The rate at which you lose muscle tissue significantly affects how fast you "age". Strength building exercise will slow this natural loss of muscle tissue. Would you rather age quickly or slowly? What kind of shape would you prefer to be in when you're in the Fall and Winter of your life?
The Push Press is a move that incorporates your entire body. While the strict press focuses only on the upper body, the push press incorporates the lower body to drive the bar up overhead. This synchronic movement is great for building power and pure strength. HOW TO DO IT: Start with the bar across your shoulders. Your hands position on the bar should be just slightly outside of your shoulders, and your feet should be shoulder-width apart. Brace your core, dip slightly into a quarter squat and squeeze your glutes while driving the bar up overhead. Complete the movement with your arms in the lockout position overhead. There is only one dip in the push press, and that is when you push the bar overhead. There should not be a second dip at the top of the bar path or that movement would be called a “jerk.” MUSCLES USED: Glutes, quads, hamstrings, shoulders and core.
Too much exercise can be harmful. Without proper rest, the chance of stroke or other circulation problems increases,[80] and muscle tissue may develop slowly. Extremely intense, long-term cardiovascular exercise, as can be seen in athletes who train for multiple marathons, has been associated with scarring of the heart and heart rhythm abnormalities.[81][82][83] Specifically, high cardiac output has been shown to cause enlargement of the left and right ventricle volumes, increased ventricle wall thickness, and greater cardiac mass. These changes further result in myocardial cell damage in the lining of the heart, leading to scar tissue and thickened walls. During these processes, the protein troponin increases in the bloodstream, indicating cardiac muscle cell death and increased stress on the heart itself.[84]
There are many things a consumer can do to minimize unsatisfactory purchases when it comes to exercise videos. We have put together a buyer’s guide that will give you a lot of information on learning as much as you can about exercise videos and what they are about BEFORE you spend the money. When you are armed with this information you can be more assured that the videos you decide to purchase will actually be ones you use.
How to: Facing down, place your hands slightly wider than shoulder-width apart. Place your toes on the floor. If that's too hard, start with your knees on the floor. Your body should make a straight line from shoulders to knees or feet. Keep your rear-end muscles and abs engaged. Bend your elbows to lower down until you almost touch the floor. Lift back up by pushing through your elbows, Keep your torso in a straight line throughout the move.

Most of the literature agrees that FO, NFO and OTS must be viewed on a continuum with a disturbance, an adaptation and finally a maladaptation of the hypothalamic–pituitary–adrenal axis (HPA), resulting in an altered hormonal response to intense training and competition.3,–,12 When investigating hormonal markers of training adaptation, it is important to target specific hormones for their information potential and to synchronise their sampling in accordance with their response patterns.
Ten patients who consulted a sports physician with complaints of underperformance and fatigue participated in the present study. The eight men and two women had an average height and weight of 181±(8) cm and 68.4±(11.8) kg. All subjects were diagnosed by a sports physician according to the latest guidelines for overtraining diagnosis.1 18 A careful history including training history was taken, completed by a physical examination and a blood draw to rule out other possible causes for the complaints. Patients were diagnosed as NFO or OTS retrospectively according to the severity of symptoms and the total duration of symptoms and underperformance (ie, both before and after testing) when no medical explanation for the condition could be found. It turned out that a cutoff of 1-year total duration gave a good distinction between NFO and OTS patients. Demographic data and reported symptoms can be found in table 1. Data of subject 1 are the same as presented in an earlier publication.10 All subjects signed informed consent before participation.
The best 7-minute workouts on the planet are the ones you’ll actually do. This is what I know for sure after testing out more than 30 of them over the past few months. That and yes, they really do work. Adding in short blasts of high intensity interval (HIIT) training consisting of various strength, cardio, core, and flexibility exercises whenever I have a spare seven minutes in my day, have helped me get stronger, leaner, faster, and to feel better overall.
For active types, nagging injuries nag a little louder; hard workouts deplete you a bit more. For serious recreational athletes, performance begins to drop, even if you maintain your training regimen. Whatever your sport of choice — be it distance running, competitive cycling, or pick-up basketball — you can expect your performance to plateau and recovery to take a bit longer.
This stands for rate of perceived exertion, and refers to intensity. It’s a point of reference that trainers often use to communicate how hard you should be working since what feels easy or challenging is different for everyone. On the RPE scale a 1 pretty much means zero effort while a 10 means you’re working harder than you thought you possibly could.
I've given this program a good 6 weeks so far. I'm 5-10 pounds overweight with some physical issues and a history of car crash injuries. I have a medical degree and a background in nutrition and fitness with several years of yoga (various disciplines) under my belt. Overall, I do like the program, but there are some VERY important things you should know before purchasing and participating..
Planks are a quadruple threat, and by holding one for just 30 seconds a day, you will instantly start seeing results on your abdominal muscles, arms, triceps, and core. Riggins suggests doing low and high planks for 30 seconds each. For the low plank, he says to “get up on your elbows and your feet like a push-up position. You can modify by getting on your knees and hold for 30 seconds.” For the high plank do the same but “hold your legs straight” for 30 seconds. If abs are your problem area, don’t miss our helpful article Can’t Get Cut Abs? A Celeb Trainer Explains Why!
Shapiro recommends elevated quadrupled shoulder adduction for a total body workout. “Start on the floor on all fours with your knees on the ground shoulder width apart and hands on the ground shoulder width apart. Make sure your knees are in line with your hips and wrists in-line with your shoulders. Tuck your toes towards your body and straighten out your back to have a neutral posture,” he explains. “Here’s the fun part: now lift your knees off the ground just two to four inches. You should feel your arms, shoulders, core, quads, and legs shaking.” And for the finale? Utilize the back—begin by pushing your upper back to the sky, separating your shoulder blades. Immediately push your chest down to pinch your shoulder blades together to target the upper back muscle groups that include the rhomboids and lower traps.
Now that you understand the vast amount of categories available to you, you can start narrowing the field of choices down by looking at the specifics of exercise videos and deciding which ones will be something you will not only enjoy but continue to use long term. If you are starting out as a beginner to exercise, then you should expect to upgrade your exercise videos as your fitness levels increase. You don’t have to stay with a beginner video when your fitness level advances to intermediate or advanced. Below are some factors to look at when looking at individual videos.
The Alfredson protocol should be continued for 12 weeks to see optimal results.  During that time, you may wish to consult with a physical therapist who can offer advice on when to return to normal activities, such as running.  Your physical therapist can prescribe balance exercises with a BAPS board and plyometric exercises to ensure that you will be able to run and jump without suffering a re-injury to your Achilles' tendon.
^ Jump up to: a b Kyu, Hmwe H; Bachman, Victoria F; Alexander, Lily T; Mumford, John Everett; Afshin, Ashkan; Estep, Kara; Veerman, J Lennert; Delwiche, Kristen; Iannarone, Marissa L; Moyer, Madeline L; Cercy, Kelly; Vos, Theo; Murray, Christopher J L; Forouzanfar, Mohammad H (9 August 2016). "Physical activity and risk of breast cancer, colon cancer, diabetes, ischemic heart disease, and ischemic stroke events: systematic review and dose-response meta-analysis for the Global Burden of Disease Study 2013". BMJ. 354: i3857. doi:10.1136/bmj.i3857. PMC 4979358. PMID 27510511.
What is the Level of Difficulty? – Exercise videos should specify whether they are for beginners, intermediates or advanced exercisers. Be honest with yourself when looking at the choices available and choose one that will be a good starting point. If there is a series of video, look for sets that have a progression level as your fitness level improves and increases.
Outdoors in nearby area and in nature was the most frequently reported exercise location in both training groups. This finding is in line with previous studies reporting that older adults prefer to exercise close to home [23, 30] and outdoors [23]. Interestingly, outdoors was the most common exercise location in both warmer and colder months despite the fact that colder months in Norway consist of more snow, higher prevalence of ice and relatively fewer hours of daylight compared to warmer months. The HIIT group had a higher proportion of sessions at a gym and sport facility compared to the MCT group. This finding is likely related to the fact that the HIIT group reported a higher proportion of sessions with exercise types commonly performed at these locations (e.g. swimming and other types of endurance training) compared to the MCT group. Some older adults might feel that it is easier to reach a high-intensity level with activities located at a gym and sports facility compared to outdoors.
Jump up ^ Lees C, Hopkins J (2013). "Effect of aerobic exercise on cognition, academic achievement, and psychosocial function in children: a systematic review of randomized control trials". Prev Chronic Dis. 10: E174. doi:10.5888/pcd10.130010. PMC 3809922. PMID 24157077. This omission is relevant, given the evidence that aerobic-based physical activity generates structural changes in the brain, such as neurogenesis, angiogenesis, increased hippocampal volume, and connectivity (12,13). In children, a positive relationship between aerobic fitness, hippocampal volume, and memory has been found (12,13). ... Mental health outcomes included reduced depression and increased self-esteem, although no change was found in anxiety levels (18). ... This systematic review of the literature found that [aerobic physical activity (APA)] is positively associated with cognition, academic achievement, behavior, and psychosocial functioning outcomes. Importantly, Shephard also showed that curriculum time reassigned to APA still results in a measurable, albeit small, improvement in academic performance (24).  ... The actual aerobic-based activity does not appear to be a major factor; interventions used many different types of APA and found similar associations. In positive association studies, intensity of the aerobic activity was moderate to vigorous. The amount of time spent in APA varied significantly between studies; however, even as little as 45 minutes per week appeared to have a benefit.
One way repeated ANOVAs (time: isotime from first to seventh minute and exhaustion) were used to test the time course of EMG RMS for all muscles, leg RPE, leg muscle pain and heart rate. Significant effect of time was explored with planned comparison (1st minute vs other time points, exhaustion vs other time points) adjusted with Holm-Bonferonni correction.
13.  Stretching is useful only upon awakening from sleep... it is not necessary prior to working out. As muscles become stronger, their associated tendons and ligaments will be stretched appropriately during the actual exercise, and you will have "functional flexibility", which is all you need. Many people are over-stretching their ligaments, and this leads to joint instability, which increases the chances of injury. Unless you are engaged in martial arts, ballet, or are training for the Olympics, you do not need to consciously stretch anything prior to a workout performed as outlined here.