Wrist curls can be performed with a dumbbell or with both hands holding a barbell.
To perform a seated wrist curl, the lifter should be seated on a bench with knees bent and the forearm(s) resting on the thigh, or with forearms on a bench and hands hanging off the edge.
In a steady motion, the lifter should raise the weight by using the forearm muscles to bring the hand up as far as possible.
To perform a standing wrist curl, a barbell can be held in both hands with the palms facing backward.
The range of motion will be smaller but the standing wrist curl offers the benefit of providing the most stress on the target muscles at their peak contraction.