Suddenly starting a lot of exercise will stimulate muscles and internal organs. Pay attention not to train too much and exercise for too long. It is best to exercise three to five times a week. And pay attention to combining work and rest. A few days after exercise, the increase of heart rate mainly occurs in people who have just started exercising, mainly because the stimulation brought by exercise at the beginning is not suitable for internal organs, muscles and endocrine. You don't have to worry! ! ! If there is something wrong with the heart, it should be cold and numbness at the end of the limbs! I wish you a happy exercise.