The EZ Bar is often preferred for close grip curls because the shape of the bar takes some of the strain off your wrists.
1. Keep your body fixed and use your biceps to move the weight.
2. keep your elbows in a fixed position.
3. Avoid moving your body for picking up momentum.
4. Squeeze your biceps at the top of the movement.
The close-grip EZ-bar biceps curls increases strength in the biceps and forearms. The closer grip places more emphasis on developing thickness of the biceps. It also places more tension on the outer head of your biceps