If you want to find a reliable fitness college, you can choose it according to the teaching methods, teaching models, teachers and courses of the training institutions. If you want to be a qualified fitness instructor, you need to master the theory and skills of professional fitness instructors. Theories to be mastered: sports biomechanics, human anatomy, physiology, psychology, nutrition, etc. Skills to master: resistance training, aerobic exercise and equipment use, stretching exercise, physical training. At present, gyms are all certified.