First: I'm too nervous, because there are many. Before exercise, I will be particularly nervous for some reasons. At this time, my muscles will be particularly stiff and I will realize that I can't let go. At this time, I can hammer my leg with my own hand to relax myself first, which will relieve the stiff state!

Second: Don't think that it's useless not to do a little warm-up before strenuous exercise. When you start exercising directly, your muscles will be so stiff and tense that you can't play your original level.

Third: you don't exercise for a long time. If you exercise every day, your muscles will adapt to this "habit" and even adjust themselves. If you lack exercise, this will happen naturally!

Fourth: There is another situation where you exercise too hard and your muscles haven't "adapted".

Remember to warm up before exercise, and if you have stiff muscles, beat your legs with your hands!