目标肌肉:
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腹肌
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屈膝，肩部离开地面，一手放在一个膝诱W
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动作:
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呼气∶收紧腹肌，同时伸直一条腿，两手放在屈曲腿的膝诱W
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# m N" W6 w% D* g( W6 ]www.xmjeep.com呼气∶伸直另一条腿，两手放在另一屈曲腿的膝诱W
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强化腹肌和躯干的稳定性
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Remarks:
% ^9 Y# E1 X% _; S' ]0 v# Z( C Special Thanks to Stephanie Tsui for demonstration
