Bicep curls are an upper body exercise that builds strength in the biceps. These can provide extra support for larger compound exercises like pull-ups and barbell rows.
Strengthening the bicep involves concentric motion of the arm with a weight. The standard bicep curl is done holding dumbbells.
The variations of the bicep curl further isolate or target different parts of the bicep.
A barbell variant that uses a preacher bench and ez-bar. Grasp the bar at shoulder width and contract upwards. Let the arms straighten fully before performing another rep.
Hammer curl is identical to the normal bicep curl except the wrist stays static through the entire motion.