Joint noise is a common phenomenon and usually does not cause pain or discomfort. This phenomenon may be due to the bursting sound of gas in joints or the rubbing sound of soft tissues such as muscles and ligaments. If the warm-up activities are not done well, the ligaments are still tense and the joint pressure will be too high. If there is no obvious pain or limited activity, don't worry, please stretch the soft tissue properly. Learn the correct posture, maintain good flexibility, fully stretch, adjust joint position, balance strength, and fully warm up before training.