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Sit on an exercise ball and do one minute of ab curls.
坐健身球上，收腹1分钟。
youdao
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Bouncing on an exercise ball or birthing ball while you hold her.
抱着宝宝在健身球或分娩球上轻轻弹跳。
youdao
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Bouncing on an exercise ball or birthing ball while you hold her.
抱着宝宝在健身球或分娩球上轻轻弹跳。
youdao