Usually, I think everyone will have this experience. After exercise or fitness, they will feel pain in their arms, legs and stomachs, and sometimes it will hurt if they are lifted slightly. In fact, this is a relatively normal scene. Because human muscles consume energy during exercise, it takes a lot of oxygen to decompose glucose. Because of the large demand, there is insufficient oxygen in normal blood, and glucose cannot be completely decomposed. Anaerobic metabolism produces lactic acid, which accumulates in muscles and is not excluded from the body. In this case, people will feel the symptoms of pain. Therefore, you must be prepared before fitness, such as stretching, and if you want to drink water after exercise, you can add some salt to the water, or apply ice cubes to the places where you feel pain, and then massage properly. These methods can effectively relieve pain. Then stick to it every day. After a long time, you won't feel instant pain if you exercise again. ?