Swf The arm and shoulder rotation stretch warms up the muscle that surrounds the shoulder jointed the body. These muscles are used continuously during swimming.

 
  • 手臂和肩膀的旋转伸展动作帮助肩部及其联接躯干的肌肉群充分热身。游泳时将连续不停的运用这些肌肉。
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