It's not a matter of time. First of all, after strenuous exercise, you need to supplement appropriate water (but you can't drink it right away) and electrolytes. Second, lactic acid is produced after exercise, and the body is acidic. It is advisable to supplement some alkaline foods, such as fruits. Third, focus on stretching and reverse stretching for at least 10 minutes, which is conducive to muscle relaxation and recovery. For example, sit up and expand your chest after practicing your chest, and do body flexion after practicing your calf. Fourthly, it is also a very effective method to massage the sports parts properly. Fifth, take a hot bath after your body is calm, not immediately. Sixth, supplement carbohydrates and protein, which is the focus of muscle repair. Seventh, adequate sleep and rest, strenuous exercise should not be carried out for a long time, no more than 3 or 4 times a week.