One reason is that I have never done such strenuous exercise in my body, and then I suddenly exercise until my body is overloaded, and then I can't bear this amount of exercise. Maybe I was tired at that time, and I didn't feel strange. But when you wake up the next day after a sleep, you may feel weak and weak, and your legs are weak. This is the result of excessive exercise the day before, the fatigue of the body can not be alleviated, and excessive accumulation of lactic acid.
Therefore, if you don't exercise for a long time and then suddenly want to exercise, you need to warm up from the beginning. Don't do high-intensity strenuous exercise as soon as you get up, so it is difficult for our bodies to adjust to this mode immediately, and it is easy to be out of breath, cramp or vomit. Therefore, it is necessary to warm up at the beginning, let the body warm up and reach the state of exercise, and then exercise step by step, not in one step. After all, if you don't exercise all the time, you can't exercise suddenly and quickly.
Of course, after exercise, remember to stretch and stretch your whole body. In this way, lactic acid will not accumulate in one place, causing leg or ass pain the next day. Stretch well and relax all over. Then don't stay up late, go to bed early, and let your body get enough time to recover. If you still stay up late, you may wake up the next morning because you don't have enough rest and your body is particularly weak. We must have enough rest to relieve fatigue.