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.
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。
Exhale slowly while making small circles with leg.
慢慢呼气同时腿划小圈。
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