Dumbbell Hammer Curl

Definition

The dumbbell hammer curl is a pull/isolation exercise performed with a neutral (palms-facing-each-other) grip. Standing upright, the athlete curls the dumbbells from arm's length to shoulder height without rotating the wrists. The neutral grip shifts emphasis from the biceps to the brachialis and brachioradialis, building the forearm and grip strength that HYROX^® athletes rely on during carries, sled pulls, and rowing.

Technique & Form

1. Starting position - Stand with feet shoulder-width apart, a dumbbell in each hand at arm's length with palms facing the body (neutral grip).
2. Curl phase - Flex both elbows to curl the dumbbells toward the shoulders. Keep the upper arms stationary and the wrists neutral throughout.
3. Lowering phase - Lower under control to full extension.
4. Breathing - Exhale during the curl; inhale on the descent.
5. Tempo - 1 second up, 2 seconds down.

Muscles Worked

• Primary movers: Brachialis, brachioradialis, biceps brachii
• Stabilizers: Forearm flexors, anterior deltoid, core

Common Mistakes

• Swinging the torso - Using momentum reduces forearm engagement. Fix: brace the core and keep the torso still.
• Wrist rotation - Turning the palms up during the curl shifts it to a standard bicep curl. Fix: keep palms facing each other throughout the entire rep.

Benefits

• Builds brachioradialis and forearm strength for better grip endurance.
• Strengthens the elbow flexors in a neutral position that mirrors how the hand grips implements.
• Develops the forearm thickness that supports heavy carries and extended sled pull efforts.

HYROX^® Context

The hammer curl supports the Farmers Carry, Sled Pull, and Rowing stations by building the forearm and grip strength these stations demand. The neutral grip matches the hand position used during farmer's carries and sled rope gripping. Program 2-3 sets of 10-15 reps at the end of pull-day sessions alongside dumbbell bicep curls and dumbbell rows.

Variations & Alternatives

• Dumbbell Bicep Curl - Supinated grip for greater bicep emphasis.
• Incline Dumbbell Curl - Incline bench for increased bicep stretch.
• Dumbbell Farmer's Carry - Functional grip endurance exercise.

FAQ

Are hammer curls better than regular curls for HYROX^®? For grip and forearm development, yes. The neutral grip targets the brachioradialis, which is more relevant to holding heavy implements than the biceps. Include both variations for complete arm development.

How heavy should I go? Moderate weight for 10-15 reps. The forearms respond well to moderate loads and higher reps. Progress when you can complete all sets with strict form.

Track your grip strength and arm accessory work with ROXBASE.