合理设计,追求练习的针对性应根据课中教材的练习强度、负荷大小,以及动作技术原理选择放松练习的内容和形式,并进行针对性的放松。如在短跑、跳跃练习中,肌纤维中的粗细肌丝相互滑行,导致肌肉收缩、做功;练习后,要特别注意粗细肌丝复位,使肌肉放松,以缓解肌肉的紧张,而拉伸性练习可以有效地解决这一问题。在做拉伸性练习时,应要求学生做到动静结合,逐步 Reasonable design, the pursuit of the relevance of the practice should be based on class teaching materials practice intensity, load size, and the principle of action techniques to choose the content and form of relaxation exercises, and targeted relaxation. Such as in the sprint, jumping exercises, the muscle fibers in the thick and thin filaments sliding each other, leading to muscle contraction, work; practice, pay special attention to the thickness of muscle filaments reset, relax the muscles to ease muscle tension, and stretching exercises can Effectively solve this problem. In doing stretching exercises, students should be required to do the combination of static and dynamic, and gradually