热身──气候寒冷后,人体各器官会自动保护性收缩,肌肉、肌腱和韧带的弹力和伸展性比夏天大大降低,关节活动范围减小,再加上空气湿度较小,所以人很容易感到干渴烦燥,感到身体发僵,不易舒展。如果不做热身活动就锻炼,往往会造成肌肉拉伤、关节扭伤。　　所以在冬季进行健身锻炼 Warm up ─ ─ cold weather, the human body organs will automatically protect the contraction, muscle, tendon and ligament elasticity and extensibility greatly reduced than in summer, joint activity range decreases, together with the air humidity is small, so people can easily feel Thirst irritability, feel stiff body, not easy to stretch. If you do not warm-up activities on the exercise, tend to cause muscle strain, joint sprains. So in the winter fitness exercise