Suggest doing the exercises on the lawn or on wooden floor or soil floor, never do rope skipping on hard concrete, lest to damage joints, or cause brain concussion.
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lest to damage joints
以免损伤关节
以上为机器翻译结果，长、整句建议使用 人工翻译 。
应用推荐
模块上移
模块下移
不移动