Set an incline bench to about 45°, and place it in front of a high-cable pulley with a short straight bar attached. Grab the bar, and sit back on the bench. Your arms should be straight and angled upward toward the pulley. Without any shoulder or upper-arm movement, strictly curl the bar toward the forehead. Hold the peak contraction for 1 to 2 seconds, actively flexing the biceps. Slowly return the bar to the starting position.
Trainer’s Tips
Make sure not to curl too explosively, so as not to bang the bar against your head.