That's a muscle spasm. Muscles are usually relaxed and suddenly tightened, which is normal, easy to get hurt and boring. Therefore, it is normal to warm up for about 10 minutes before strenuous exercise, such as jogging to exercise joints ~ but if all these are done and the amount of exercise is not particularly large, you will tremble. Insufficient calories and sugar in the body may also cause muscle weakness and trembling ~ drink high-sugar drinks such as honey water and orange juice after exercise ~ seek adoption.