Sit with your forearms resting on your thighs or on a flat bench. Take an overhand grip on the bar or dumbbells with your arms passively flexed, i.e., flexed just enough to hold the weight.
1. Curl your wrists back toward you as far as you comfortably can.
2. Return to the starting position for the next repetition.
Notes: This is an excellent movement for strengthening the wrist extensor muscles.