warm up
About 5 minutes, the shortest time, but the effect can not be ignored. Warm-up content generally includes two kinds, one is muscle stretching, and the other is dynamic stretching. Wake up those joint muscles that have been useless for a day and tell them that they can work soon. Second, bounce around to warm their bodies and prevent our high-intensity exercise from hurting our knees in the future. Relaxation activities are all kinds of physical activities after physical fitness activities, mainly including low-intensity activities such as walking or jogging and various pulling exercises.