蜘蛛彎舉 — 動作分析

Excessive Shoulder Movement

Allowing the shoulders to lift or shrug during the curl indicates that other muscle groups are assisting, reducing the isolation on the biceps. This compromises the exercise's effectiveness for bicep development and can place undue stress on the shoulder joint.

Incomplete Range of Motion

Failing to fully extend the arms at the bottom or fully contract the biceps at the top limits the muscle's work and growth potential. Partial reps reduce the time under tension and the stretch stimulus on the bicep.

Using Momentum (Swinging)

Swinging the weight up by using body English or hip drive indicates the weight is too heavy or control is lacking. This shifts the focus away from the biceps and increases the risk of lower back or elbow injury.