The only measures that accurately distinguished NFO from OTS were increases in ACTH and PRL concentrations after a second maximal exercise bout. The OTS athletes showed a very small or no increase in ACTH and PRL concentrations after the second exercise bout; the NFO athletes showed very large increases. This is a confirmation of our previous studies with this protocol.10 22 The use of two bouts of maximal exercise to study neuroendocrine variations showed an adapted exercise-induced increase of ACTH, PRL and GH to a twoexercise bout.10
In the third week of the program we step it up to a three-day training split: Train all “pushing” bodyparts (chest, shoulders, triceps) on Day 1; hit the “pulling” bodyparts (back, biceps) and abs on Day 2; and work your lower body (quads, glutes, hamstrings, calves) on Day 3. As in Week 2, you train each bodypart twice a week, so you’ll hit the gym six days this week.
Start in a low lunge position with right foot forward, left foot back, and fingertips touching the ground for balance. In one smooth movement, bring left foot forward and, as you stand on right foot, continue to lift left knee toward chest and hop up on right foot. Land lightly on right foot and immediately slide left foot behind you to return to starting position. Repeat for half the time then switch to the other side.
I purchased Insanity a few years back and only lasted for 3-4 workouts. The workouts were too difficult for me and although I enjoyed it, I just failed to commit to it. Fast forward to July of this year..... I am not even sure why I attempted it again, but I am glad I did. First things first; this program is physically challenging to the point that I would recommend anyone going into it be cleared by their doctor BEFORE starting. Seeing a physician after you've injured yourself is the equivalent of closing the barn after the horses got out! There, it's been said. Now on to my review of this product.

11. De Vries N. M., van Ravensberg C. D., Hobbelen J. S. M., Olde Rikkert M. G. M., Staal J. B., Nijhuis-van der Sanden M. W. G. Effects of physical exercise therapy on mobility, physical functioning, physical activity and quality of life in community-dwelling older adults with impaired mobility, physical disability and/or multi-morbidity: a meta-analysis. Ageing Research Reviews. 2012;11(1):136–149. doi: 10.1016/j.arr.2011.11.002. [PubMed] [Cross Ref]
Thus, little is known about the effects of monitored vigorous exercise in elderly people. While significant benefits for basic motor tasks (such as balance and gait) can be achieved through different kinds of physical activity (i.e., stretching exercises, treadmill, Pilates, and strength and balance training), no conclusive relationship has been proven between its intensity and such improvements. Recently, Pau et al. [14] reported that spatiotemporal gait parameters and sit-to-stand performance significantly improve through vigorous (but not light) exercises, thus suggesting that higher levels of intensity might be more suitable in generally improving static and dynamic daily motor tasks.
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