1. Prevention of muscle soreness: After exercise, muscles may have discomfort symptoms such as soreness and stiffness. Proper relaxation activities can help relieve these symptoms and restore muscles.

2. Promote blood circulation: Exercise will lead to increased heart rate and vasoconstriction, thus affecting blood circulation. Relaxation activities can lower the heart rate, dilate blood vessels, promote blood circulation, and contribute to the nutrient supply and waste discharge of all parts of the body.

3. Reduce muscle fatigue: During exercise, muscles will produce metabolic wastes such as lactic acid. Relaxation activities can help remove these wastes and reduce muscle fatigue.

4. Reduce the risk of injury: After exercise, muscles and ligaments are easily damaged. Appropriate relaxation activities can help stretch muscles and ligaments, improve joint flexibility, and thus reduce the risk of injury.

5. Improve mental state: Exercise helps to release stress and relieve anxiety and depression. Relaxation activities can rest the body and mind and help to maintain a good psychological state.

6. Promote sleep: Appropriate relaxation activities can help the body gradually return to a calm state and help improve the quality of sleep.

In a word, it is of great significance to pay attention to relaxation activities after fitness exercise to keep healthy, improve exercise effect and improve mental state.