Upper arm swings to assist
Shoulder joint moves to complete the extension, removing tricep isolation.
Overactive muscles
Rear deltoidPosterior deltoid
Corrective work
Foam RollPosterior shoulder↗StretchCross-body shoulder stretch↗Shoulder joint moves to complete the extension, removing tricep isolation.
Wrist flexes at full extension, breaking the straight line and reducing tricep peak contraction.
Upper arm rotates laterally during the extension, shifting tension from long head to lateral head.