a swimming kick; an up and down kick of the feet together

the butterfly kick is also known as the dolphin kick since it is similar to the movement of a dolphin tail.

蝶泳的打腿还有一个常见的俗名，即海豚踢。这是因为这种打腿方式和海豚尾巴的运动方式非常相似。

ian: 「one of the things that i think about while i am doing the dolphin kick on my back is trying to have proper head position.」

伊恩：“我在进行仰蝶海豚腿的练习时总是尽量保持正确的头部位置。

to swim butterfly correctly it is important to have mastered the body undulation and dolphin kick first before adding the arm movement.

游泳是很重要的蝴蝶正确掌握身体的海豚式打腿前、巖面起伏及其裸露程度增加臂的运动。

the dolphin kick and body undulation exercises simply teach you how to learn the technique described above.

海豚式打腿练习和身体的波动只是教你怎么学技术前述。

the goal here is to finish the recovery of the hands before the dolphin kick comes in.

这个练习的目的是在开始打蝶泳腿前完成（更有效的）划水。

kick dolphin kick in this position for the duration of the set.

在这个位置踢海豚式打腿持续集合。

you can use a dolphin kick for either freestyle or butterfly, but for the start, remember to use a smaller, faster dolphin kick.

你可以在自由泳和蝶泳（入水后）打蝶泳腿，但在刚开始的时候，一定记住蝶泳腿要做到幅度小、速度快。

ian: 「one of the most important aspects of having good underwater dolphin kick is having a tight streamline.」

伊恩：“要做到完美的水下海豚腿，最重要的是保持紧密的流线型。

your weakness, the endurance end of the kick, can be developed by doing fast dolphin kick sets underwater.

你的弱项，也就是打腿的耐力，可以通过多组的快速水下海豚腿的练习来改善。

some people have it easier to learn the dolphin kick and body undulation than others, and it seems that girls learn this motion faster than boys.

有些人把它易于学习海豚式打腿和身体的波动，似乎比其他女孩比男孩学习这个动作快。