I don't agree with the first floor. Whether it is physical labor or sports, muscles are developed by "moving". How can we relax? The only difference is: insist! Exercise is intermittent, but if you work, you really have to work every day. Otherwise, where can I make money to eat? )

Therefore, it is recommended to exercise regularly so that the meat will not relax.

Another very important reason is that when people reach middle age, their physical function declines, their maintenance is not good, and their male skills are weak, so their meat will relax!