（三）身要灵活 Flexible Body Movements
长拳的身法，要柔韧、灵活、自如，须“腰如蛇行”。身法在长拳运动里，可分为闪、转、展、缩、折、弯、俯、仰等。这些身法的变化多是主宰于腰。因此，“腰如蛇行” 的身法要求：一方面，要求各种身法在运动的时候要像蛇行那样灵活，有曲折有变化；另一方面，也要求胸椎和腰椎的柔韧性要好，使动作做得既柔软又坚韧，柔软则灵活，坚韧则有力。动作做得灵活、有力，又富有曲折变化，才会协调而生动。身法包括胸、背、腰、腹和臀五个部分。在一般的长拳运动中，由活动性动作进入到静止性动作时，多讲究挺胸、直背、塌腰、收腹、敛臀等方式方法。在活动时，则要求灵活自如。“体随势变”，根据不同的动作采取不同的身法与手、眼、步、腿诸法协调配合。
The body movement techniques of Chang Quan should be pliable，flexible and smooth，like “The waist shall move like a snake”.In Chang Quan，the body movement techniques include：Shan，Zhuan，Zhan，Suo，Zhe，Wan，Fu，Yang and so on.All these techniques almost dominated by the waist.Therefore,“The waist shall move like a snake” means that on the one hand all body techniques shall move and change as flexible as a snake；on the other hand，thoracic vertebra and lumbar vertebra shall also be pliable.The movements shall be pliable and forceful.Being pliable to be flexible and being tenacious to be powerful.Only when the movements are flexible，powerful，and changeable that can the body be vivid and in good coordination.Body techniques include five parts：chest，back，waist，abdomen and buttocks.In normal Chang Quan movements，changing from dynamic movements into static movements,generally pay attention to several ways erecting chest，straightening back，dropping waist，constricting abdomen and drawing buttocks in.Chang Quan exercise requires flexibility，“Body moving with postures”， choosing different body moving techniques according to different movement to a coordinate with various other techniques such as hands，eyes，steps and legs etc..