视频4：原地跳高https://v.qq.com/txp/iframe/player.html?vid=y0544p83p5x&width=500&height=375&auto=0
视频5：双杠臂屈伸https://v.qq.com/txp/iframe/player.html?vid=i0544p1e8mv&width=500&height=375&auto=0
视频6：屈膝仰卧起坐https://v.qq.com/txp/iframe/player.html?vid=d0544e1uwhx&width=500&height=375&auto=0
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