Large muscle groups: chest, back and legs. Large muscle groups suggest exercising once a week. Small muscle groups: shoulders, biceps, triceps, forearms, calves and abdominal muscles, which can be arranged twice a week. The calf and forearm muscles belong to tolerance muscles and can be arranged three times a week. It is recommended that beginners only practice large muscle groups, such as pectoral muscle, latissimus dorsi muscle and thigh muscle. After a month or two, the whole body strength rises, and then the small muscles are interspersed with the big muscles to train together, so that the big muscles and groups can drive the small muscles to grow. If you practice small muscle groups from the beginning, you will basically practice in vain.