Need to relax. First pat the abdomen with both hands, then lie flat and stretch the abdominal muscles, put your arms flat on both sides of your head, stretch back as far as possible, palm up, back slightly off the ground, make the abdomen arch, then breathe gently, inhale through your nose, exhale through your mouth, and adjust your breathing several times like doing yoga, which will relax your muscles.

Extended data:

Stretching exercise is a fitness method, which can make the coordination between ligament muscles and joints softer and reduce the possibility of injury. Including active stretching and passive stretching.

The so-called active stretching refers to keeping the movement in a specific position mainly by the strength of muscle contraction, rather than other external forces. The advantage is that it can increase the flexibility of action and the strength of muscle contraction. The so-called passive stretching refers to using one's own weight or equipment to keep the limbs in a certain stretching posture. This is a slow and relaxing stretching, which can also be expected to reduce the excitability of nerves and muscles. This is a good way to relax after exercise.

References:

Stretching-Baidu Encyclopedia