视频7：俯卧撑https://v.qq.com/txp/iframe/player.html?vid=c0544pluxg3&width=500&height=375&auto=0
视频8：坐位体前屈https://v.qq.com/txp/iframe/player.html?vid=j0544bymcqe&width=500&height=375&auto=0
视频9：立卧撑https://v.qq.com/txp/iframe/player.html?vid=j0544bymcqe&width=500&height=375&auto=0
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