蝴蝶機夾胸 — 動作分析

Excessive Elbow Extension

Straightening the elbows too much shifts tension from the chest to the biceps and elbow joint, increasing risk of hyperextension injury and reducing pec activation.

Rounding the Shoulders Forward

Allowing the shoulders to roll forward at the end of the movement can lead to shoulder impingement and reduces the stretch on the chest muscles, diminishing effectiveness.

Using Momentum/Jerking

Swinging the arms or using momentum to bring the pads together reduces muscle time under tension and increases the risk of injury to the shoulder joint and rotator cuff.