V-ups在做的时候 要保持脚和上背不碰地比较好吗? 可是exrx上面写得好像不太一样 上面说waist要有flexion腹肌才会是dynamically contract 还是我弄错了他的意思? 附一下原文 Begin each repetition with upper back on floor to allow abdominal muscles to work dynamically. The Rectus Abdominis and Obliques dynamically contract only when actual waist flexion occurs. With no waist flexion, Rectus Abdominis and External Oblique will only isometrically contract to stabilize the pelvis and waist during hip flexion. 照原文的意思是上背可以碰地 脚不要噜? ※ 编辑: ghfjdksl 来自: 61.221.104.193 (09/25 18:33)