The arm exercises come at the end of a punishing workout routine for Mrs Obama which also involves weight training, rope-jumping and kickboxing.

米歇尔通常在完成很费体力的举重、跳绳和跆拳道等例行练习后，进行这套臂膀练习。

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Mark: I often go to a gym for a workout. Lifting weights will build arm and shoulder muscles, won't it?

马克：我经常去体操馆锻炼。举重可以锻炼手臂和肩膀的肌肉，不是吗？

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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。

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