There are many kinds of fitness equipment. At present, there is no unified classification, but from the functional diversity of fitness equipment, it can be divided into two categories: single function and comprehensive multi-function. Single-function trainer: common rowing machines, exercise bikes, walking machines, treadmills, waist-beautifying machines, treadmills, etc. Multi-functional trainer: generally including chest enlargement, pull-ups, sit-ups and other functions. Chest enlargement, pull-ups and supine pressing are mainly used to exercise upper limb strength and pectoralis major strength; Sit-ups are mainly used to exercise waist muscles and reduce excess fat in the waist and abdomen.