Select your weight. Adjust seat. Lean slightly forward and grip handholds with back of hand facing down. The thumbs are under the handholds. Make sure that wrists are in line with pivot of lever arm.
Bend up your hands at the wrist as far as possible. Hold position briefly. Lower hands to starting position without letting the weight touch down. Repeat until a full movement is no longer possible.

Important: Forearms must remain on pads.