For they keep them flatter and keep them propelling themselves forward, not up. Try to get them to just clear the water with their chin only about an inch.

 
  • 因为单臂蝶可以使你游得更平一些,给你向前的推力,而不是向上的推力。控制头部刚好出水,下巴离水面一寸远。
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