此内容来自第三方平台 (Dailymotion)。如果此视频侵犯了您的版权，请使用 立即删除 工具。
Pullups
描述
A pull-up is an upper-body strength exercise. The pull-up is a closed-chain movement where the body is suspended by the hands and pulls up. As this happens, the elbows flex and the shoulders adduct and extend to bring the elbows to the torso.