Body roll occurs largely to position sets of muscles to move joints to produce longitudinal forward propulsion and coupled with the arm pull produces a more direct propulsive force off the hand/forearm-propelling surface.
Body roll occurs largely to position sets of muscles to move joints to produce longitudinal forward propulsion and coupled with the arm pull produces a more direct propulsive force off the hand/forearm-propelling surface.
身体的滚动幅度大会使肌肉群一起运动产生纵向的推进力而且是两倍于手臂划水直接产生的推进力。