Alternating DB Hammer Curls (How To & Benefits)

The Alternating Dumbbell Hammer Curl is a biceps exercise that emphasizes both the biceps brachii and the brachialis—the muscle that adds thickness to the upper arm. By holding the dumbbells with a neutral grip (palms facing each other), you reduce wrist strain and engage the forearms more effectively.

Alternating sides helps maintain focus and control throughout each rep.

Primary Muscles Worked: Biceps Brachii, Brachialis
Secondary Muscles Worked: Forearms (Brachioradialis), Shoulders (stabilization)
Equipment Needed: Dumbbells

How To Do Alternating DB Hammer Curls

Step-by-Step Instructions

Set-Up:
- Stand tall with a dumbbell in each hand, arms fully extended, and palms facing each other.
- Keep your chest up, shoulders back, and core engaged.
Execution:
- Curl one dumbbell upward toward your shoulder, keeping your palm facing inward the entire time.
- Squeeze your biceps at the top of the movement.
- Slowly lower the dumbbell back to the starting position.
- Alternate to the other arm and repeat.
Tips for Proper Form:
- Keep your elbows close to your torso, don’t let them drift forward.
- Move only at the elbows; avoid swinging or using momentum.
- Maintain a steady pace and full range of motion.

Key Benefits

Builds both size and strength in the biceps and forearms.
Reduces wrist and elbow stress compared to supinated curls.
Improves arm symmetry and control with alternating reps.

Modifications and Variations

Easier Option:
- Perform seated to reduce momentum and improve control.
- Use lighter dumbbells for higher-rep form work.
Harder Option:
- Add a pause at the top of each curl.
- Perform both arms simultaneously for more time under tension.
- Use a slow eccentric phase (3–4 seconds lowering).

Common Mistakes

Swinging the Dumbbells: Focus on controlled, deliberate reps.
Elbows Drifting Forward: Keep them pinned near your sides.
Incomplete Range of Motion: Fully extend at the bottom for maximum benefit.
Rushing Through Alternations: Let each arm move independently and smoothly.

Reps and Sets Recommendations

For Strength: 3–4 sets of 6–8 reps per arm.
For Hypertrophy: 3–4 sets of 10–12 reps per arm.
For Endurance/Accessory Work: 2–3 sets of 12–15 light, controlled reps per arm.