1 . Science shows that stretching us essential after exercise. Stretching lengthens and mobilizes the connective tissue around your muscle. What’s more, stretching helps your blood flow and even relieves your stress.     1    

You could feel sick. You won’t be surprised to know that when you exercise, you raise your heart rate for a period of time. While it’s great to get that blood flowing, it’s just as important to get your heart rate back to a normal level after the workout is over.     2     As your heart is beating faster and your body temperature is higher, you could pass out or feel sick if you stop too fast. Stretching after physical activity allows a gradual decrease at the end of the episode.

Your muscles will likely become stiffer and sorer. When you exercise your muscles, it produces lactic acid (乳酸), which is actually what causes your muscles to become sore. When you rest between periods of exercise, your body naturally breaks down that lactic acid. Is there one thing that helps your body get rid of that lactic acid?    3     Stretching helps you distribute oxygen throughout your body, which can reduce lactic acid production and rid your muscles of any accumulation of lactic acid.

    4     Flexibility is closely related to injury risk. Poor flexibility will cause you to have muscles that get tired quicker and joints that are more likely to suffer from injury. Besides, your weakened range of motion will lead to less blood and nutrients to your joints.     5     Sticking to stretching exercise after physical activity can hopefully improve your flexibility.