The theoretical knowledge that a fitness instructor needs to master includes sports nutrition, sports anatomy, sports physiology, sports planning principles, health and fitness, and so on. These theoretical knowledge is the basis of learning advanced skills, especially sports anatomy, and also the basic knowledge of learning sports rehabilitation skills in the later stage.

Personal trainer: physical foundation, sports medicine, sports nutrition, sports anatomy, sports psychology, sports prescription, equipment use and protection, special group training, small equipment personal training and so on.

Group aerobics instructor: aerobics, comprehensive dance, step exercise, boxing, spinning, pilates, etc.