Fitness is a kind of exercise that can improve people's health and enhance people's physique. The exercise forms and methods of fitness need to be formulated according to the principles of human life science to promote people's physical and mental health, and unscientific excessive exercise will lead to human injury. The scope of fitness is very wide, and exercise is only one part of fitness. Besides exercise, there are many contents of fitness, such as writing, singing, doing housework and practicing yoga. Fitness can be roughly divided into instrumental exercise and non-instrumental exercise. Fitness is also a sport that many men and women use to shape their perfect bodies. Modern men and women like this sport.