六次打腿的运动员在水中抬腿的高度稍高，无论在训练中还是在比赛中，这种动作对于能量的要求都要高于两次或者四次打腿。
A six-beat kick raises the legs slightly higher in the water, and the energy needed to maintain this kick during training or racing is higher than for a four-beat or two-beat kick.
你也可以在水底走路或做抬腿或转手臂的体操，研究显示，在水里做有氧运动能以较少时间达到在陆上做同样的效果。
You can also "take a walk" underwater or perform calisthenics like leg lifts or arm circles. Research shows that water actually offers an equal aerobic workout in less time than one on dry land.
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