How much time are you willing to devote (realistically) to working out? – Another question that being brutally honest with yourself is necessary. Pretending you will devote 2 hours to working out every day isn’t practical unless you do that in some form NOW. Most people can’t keep up a two hour a day workout program unless they are professional fitness trainers or competitors. Exercise videos come in all lengths and intensity levels. Some are very short; others may be 60-90 minutes long. Knowing how much time you have to devote to working out will help you choose an exercise video that provides what you need in the time frame you have available. This will also encourage you to continue using it.
Developing research has demonstrated that many of the benefits of exercise are mediated through the role of skeletal muscle as an endocrine organ. That is, contracting muscles release multiple substances known as myokines which promote the growth of new tissue, tissue repair, and multiple anti-inflammatory functions, which in turn reduce the risk of developing various inflammatory diseases.[114] Exercise reduces levels of cortisol, which causes many health problems, both physical and mental.[115] Endurance exercise before meals lowers blood glucose more than the same exercise after meals.[116] There is evidence that vigorous exercise (90–95% of VO2 max) induces a greater degree of physiological cardiac hypertrophy than moderate exercise (40 to 70% of VO2 max), but it is unknown whether this has any effects on overall morbidity and/or mortality.[117] Both aerobic and anaerobic exercise work to increase the mechanical efficiency of the heart by increasing cardiac volume (aerobic exercise), or myocardial thickness (strength training). Ventricular hypertrophy, the thickening of the ventricular walls, is generally beneficial and healthy if it occurs in response to exercise.
Super setting means pairing two exercises and doing them back-to-back, explains Lefkowith. There are a few ways to do these: You could save time by working two different muscle groups (like arms and legs) so you don’t need to rest in between exercises, because one muscle group is recovering while the other is working. Or, you could do two exercises that work the same area to completely fatigue one muscle group. Another option is to pair “push” and “pull” movements—for example, a push-up and a pull-up. “Super sets can be helpful if you are short on time and still want to focus on building strength,” explains says Lefkowith. And because you’re doing movements paired together, you’re likely to raise your heart rate, too.
Major variants: incline ~ (more emphasis on the upper pectorals), decline ~ (more emphasis on the lower pectorals), narrow grip ~ (more emphasis on the triceps), push-up (face down using the body weight), neck press (with the bar over the neck, to isolate the pectorals), vertical dips (using parallel dip bars) or horizontal dips (using two benches with arms on the near bench and feet on the far bench, and dropping the buttocks to the floor and pushing back up.)

Jump up ^ Hubal MJ, Gordish-Dressman H, Thompson PD, Price TB, Hoffman EP, Angelopoulos TJ, Gordon PM, Moyna NM, Pescatello LS, Visich PS, Zoeller RF, Seip RL, Clarkson PM; Gordish-Dressman; Thompson; Price; Hoffman; Angelopoulos; Gordon; Moyna; Pescatello; Visich; Zoeller; Seip; Clarkson (June 2005). "Variability in muscle size and strength gain after unilateral resistance training". Medicine & Science in Sports & Exercise. 37 (6): 964–972. PMID 15947721.
The aim of this study was to assess the effects of vigorous exercise on functional abilities by means of a Senior Fitness Test (SFT) in a group of elderly adults. Twenty healthy and inactive people performed vigorous exercise (VE: 12 men and 8 women, aged 69.6 ± 3.9 years). At the beginning of the study (T0) and after 3 months (T1), each subject's functional ability was tested for muscular strength, agility, cardiovascular fitness, flexibility, and balance. The VE was designed with continuous and interval exercise involving large muscle activities. Functional exercises were performed between 60% and 84% of heart rate reserve (HRR) for a duration of 65 minutes. Five out of the 6 SFTs performed were found significantly improved: Chair Stand (T0 12.4 ± 2.4, T1 13.5 ± 2.6, p < 0.01), Arm Curl (T0 14.2 ± 3.6, T1 16.6 ± 3.6, p < 0.01), 2 min step (T0 98.2 ± 15.7, T1 108.9 ± 16.2, p < 0.01), Chair Sit-and-Reach (T0 −9.9 ± 7.7 cm, T1 1.7 ± 6.3 cm, p < 0.01), and Back Scratch (T0 −15.8 ± 10.9 cm, T1 −8.4 ± 13.1 cm, p < 0.01). Our results suggest that a high intensity protocol and functional exercises can improve functional mobility and muscle endurance in those over 65 years of age. SFTs are an effective method for assessing improvements in the functional capacity of elderly adults.