NCAA backstroke medalist Connor Oslin demonstrates stable head in backstroke. From above water, notice that there's no side-to-side movement of the head. From under water, notice that there's no up-and-down movement of the head. He moves his head in one, direct line down the pool.
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提升卡
置顶卡
沉默卡
喧嚣卡
变色卡
千斤顶
显身卡
