Most swimmers, and in particular breaststrokers, stay under water too long.Other than in breaststroke, arm stroking should begin before a breath is taken.

• 大多数游泳运动员，特别是蛙泳运动员在水下的停留时间过长，除了蛙泳之外，手臂在呼吸之前就要开始划水了。