The process of muscle growth is composed of muscle fiber tearing and excessive recovery and thickening. In the process of fitness, adequate training, muscle fiber training to exhaustion and more energy consumption can promote muscle fiber thickening, thus promoting muscle growth.

Generally speaking, the muscle growth in each stage of fitness is as follows:

-Primary stage: increase muscle mass and strength.

-Intermediate stage: increase muscle mass, strength and endurance.

-Advanced stage: increase muscle mass, strength, endurance and body shape.