In the post bar, I saw Johnny, a great god, pointing out that 17 years old is a good period for muscle growth and strength growth. Generally speaking, foreign countries start to exercise at the age of 65,438+04, but foreigners think this age is very good. Generally, people in China are 65,438+08, and some people exercise very consciously and early. Fitness exercises are suitable for a wide range of ages. In order to keep fit, the gym often sees fifty or sixty healthy old friends.