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Dumbbell Single Arm Skullcrusher

Lie on flat bench holding one dumbbell above shoulder, palm facing in.
Bend elbow to lower dumbbell beside head without moving upper arm.
Extend arm fully, contracting triceps at the top.
Dumbbell Single Arm Skullcrusher 运动指南 - Triceps 锻炼 | MuscleWiki