If it is a useful muscle, there are only so many functional muscles in people.

If it is for fitness plasticity, then it is true that muscles may lack elasticity. There are also some drugs that have been rushed out.

Crossfit training is very popular in recent years, and the effect of elastic rope and kettle bell is also very good. But if you want to grow bigger, the traditional free weight training is the most effective, combined with crossfit, the muscles are more full and elastic.