Pick up a barbell from the floor and kneel over a flat bench with your forearms hanging off the edge. Space your hands about shoulder-width apart with your palms facing down. Curl the weight towards your body until your forearms are fully contracted. Pause briefly at the top and then lower the weight back to the starting position. Continue until you reach muscular failure.
Tip: Use a weight that is light enough for you to use a complete range of motion. You should be able to curl the weight all the way up and feel a full stretch at the bottom.
Reverse Barbell Wrist Curls - Start
Reverse Barbell Wrist Curls - Finish
Reverse Barbell Wrist Curls - Forearm Exercise Video