1. Increase muscle flexibility: Stretching can help relax tense muscles, improve the range of motion of joints, and make muscles softer and more flexible.

2. Relieve muscle soreness: After exercise, muscles may feel sore. Stretching can help alleviate this discomfort, because stretching helps to improve blood circulation, transport oxygen and nutrients to muscle tissue, and accelerate the discharge of waste.

3. Injury prevention: Proper stretching can increase muscle flexibility and reduce the risk of accidental injuries such as strain and sprain caused by muscle tension during exercise.

4. Improve sports performance: Stretching can improve sports performance, because it helps to improve the range of joint activities and enable athletes to exert their strength and speed more effectively.

5. Promote recovery: Stretching can help the body recover faster after exercise, because it helps to relieve muscle soreness, accelerate waste discharge and improve blood circulation.

In a word, stretching after fitness is very important for keeping muscles soft, preventing injuries, improving sports performance and promoting recovery. Pay attention to maintain the correct posture when stretching, and avoid overstretching to avoid injury.