Hammer Curl

Muscles Worked

How to Perform

1. 1

   Setup: Stand with feet shoulder-width apart, holding a dumbbell in each hand with a neutral grip (palms facing each other, thumbs pointing forward). Let your arms hang naturally at your sides. Keep your chest up, shoulders back, and core braced with a stable, athletic stance.

2. 2

   Initiate the Curl: With elbows pinned firmly to your sides, curl both dumbbells up simultaneously while maintaining the neutral grip throughout—thumbs stay pointing up toward the ceiling. Focus on contracting your biceps and brachialis, not using momentum. Keep your wrists straight and rigid.

3. 3

   Peak Contraction: Continue curling until the dumbbells reach shoulder level with your forearms nearly vertical. Your thumbs should be close to the front of your shoulders. Squeeze hard at the top for 1-2 seconds, focusing on the feeling in your biceps and the outer part of your forearms.

4. 4

   Controlled Lowering: Lower the dumbbells slowly back to the starting position over 3 seconds, maintaining the neutral grip the entire way. Resist gravity and keep tension on the muscles—don't let the dumbbells drop. Your upper arms remain stationary throughout the movement.

5. 5

   Full Extension and Repeat: Extend your arms completely at the bottom without locking out or relaxing the muscles. Keep your body completely still—no rocking or swinging. The neutral grip position is joint-friendly, often allowing you to handle more weight than traditional curls while reducing wrist strain.

Common Mistakes

• Rotating Wrists During Movement

  Turning your wrists from neutral to supinated defeats the purpose of hammer curls. Keep your thumbs pointing up throughout the entire range—this neutral position is what targets the brachialis and builds thickness. No rotation means maximum effectiveness.

• Leaning Back for Momentum

  Using body English to swing the weight is cheating yourself out of gains. If you need momentum, the weight is too heavy. Keep your torso upright and completely still—let your arms do 100% of the work for maximum muscle activation.

• Elbows Drifting Away from Body

  When your elbows move away from your sides or forward, you lose the isolation on your biceps and brachialis. Pin your elbows to your torso as if they're glued in place. Only your forearms should move during hammer curls.

• Bending Wrists Back

  Letting your wrists extend backward puts unnecessary strain on the joint and reduces tension on the target muscles. Keep your wrists in a neutral, locked position throughout. Grip the dumbbells firmly with wrists aligned with your forearms.

Pro Tips

• Cross-Body Hammer Curls for Variation

  Curl each dumbbell across your body toward the opposite shoulder instead of straight up. This variation hits the long head of the bicep harder and creates a different stimulus. Alternate arms or do all reps on one side before switching.

• Use Hammer Curls After Regular Curls

  The neutral grip is less fatiguing on your wrists and forearms, allowing you to push harder even when your biceps are tired. Program hammer curls after traditional curls to fully exhaust the brachialis and add complete arm development.

• Offset Grip for Forearm Focus

  Hold the dumbbells with your thumbs pressed against the inside plate, shifting the weight toward your pinky side. This offset grip increases the demand on your brachioradialis and forearm muscles, building serious grip strength and forearm size.

• Squeeze the Dumbbells Hard

  Actively crush the handles throughout the set using an irradiation effect that increases neural drive to the target muscles. This intense grip creates more muscle fiber recruitment in your arms, leading to better pumps and faster growth.

Variations

Alternatives

Related Arm Exercises