在自由泳的游进过程中,划手起着主要的推进作用,打腿产生的推进力较小,且打腿消耗的氧气更多。除了会产生推进力,自由泳打腿还会被一些教练认为可以保持身体的平衡。如果腿部下沉,阻力增大的同时还会消耗更多的能量,因此,打腿技术好的运动员身体位置较高。此外,快速的打腿动作能够将兴奋冲动反馈到中枢神经系统,使其发放更多的神经冲动,加快手臂动作,调节频率。 In freestyle swimming, swordsman plays a major role in promoting the smaller propulsion force generated by the legs, and legs consume more oxygen. In addition to generating propulsion, freestyle legs are also considered by some coaches to maintain physical balance. If the leg is sunk, the resistance increases and consumes more energy, so the athlete with good leg skills is physically positioned higher. In addition, fast leg movements can stimulate excitement back to the central nervous system, allowing it to release more nerve impulses, speed up the arm movements and adjust the frequency.