A. A supporter is important whenever you do exercises where the intra-abdomen pressure shoots up. Such exercises are squats, heavy leg press, etc. This can be corrected only through surgery. The wrist joint is not a particularly stable joint. It is subjected to undue strain in certain exercises such as heavy chest press, overhead press, dumbell curls etc.
Wrist bands provide support to the wrist joint there by preventing injury.
A. Research has shown that the incidence of injury remarkably go up when the duration of exercise is more than 45 mins. Also, the incremental physiological benefits over and above 45mins is minimal. The ligaments and tendons have a very short memory. Even if you do not stretch for a single day it tells on your flexibility. Upto six weeks.