From the traditional point of view, the meaning of "fitness" is very broad. Running, playing ball, swimming, brisk walking, cycling, playing Tai Ji Chuan and dancing in square dance are all called fitness.

Bodybuilding usually refers to the movement of developed muscles, which belongs to the category of fitness.

Some people will also do some equipment in the gym and practice regularly for a long time. Their muscles are much more developed than normal people. They think they are just playing around and not competing, so they practice [fitness]. Only by participating can it be called "bodybuilding". This distinction is incorrect.

The difference between bodybuilding and fitness mainly lies in the different training methods. As long as the purpose is to gain muscle, it can be called bodybuilding.