For example, chest muscles, back muscles, thighs and other parts need 72 hours of rest-muscles grow during this time-to get a full rest. Small muscle groups, such as arms, shoulders, calves and so on, 48 hours. Exercise doesn't need to be done every day, and you can exercise more comprehensively 4-5 days a week. The content of each day should be different and can be combined. For example, if you practice your chest muscles today, don't practice your shoulders or arms. You can practice your abdominal muscles and calves. Tomorrow, you can choose to exercise your thighs and arms ... that is, don't put too much pressure on a certain part. Give your muscles plenty of time to rest, but be full when you exercise. I wish you the best of health!