Standing with your feet spaced shoulder width, hold the grips at just wider than your stance.

Start by pressing up, like you're driving your biceps towards your ears. Press to the point where your arms are almost fully extended. Then lower back down to just before the starting position at a controlled pace. Keep your wrists aligned with your forearms at all times. Repeat for the desired amount of repetitions then rest the weight gently.

Avoid using excessive momentum from the lower body.