Lying Barbell Triceps Extensions Left side: Lying barbell triceps extensions aka “skull crushers” - Performing lying barbell triceps extensions with this technique can increase the risk of head and shoulder injury. - At the bottom of the movement, the shoulders are abducted and internally rotated under load. This can cause pain and shoulder impingement. Right side: Lying barbell triceps extensions (pullover technique) - This bar path can reduce the risk of hitting your head with the barbell. - E