Biceps · Isolation movement
Cross-Body Hammer Curl
A isolation exercise that targets the biceps with secondary work in forearms. Performed with dumbbells.
Primary muscle
Biceps
Secondary muscles
Forearms
Equipment
Dumbbell
Difficulty
Beginner
How to perform the Cross-Body Hammer Curl
- Stand holding dumbbells with a neutral grip, palms facing the thighs and the elbows tucked to the ribs.
- Curl one dumbbell diagonally across the body toward the opposite pectoral rather than straight up.
- This across-the-body path drives the brachialis and the biceps long head hard because the forearm crosses the midline.
- Keep the working upper arm pinned to the side; only the forearm swings across the torso.
- Squeeze at the top near the opposite shoulder, then lower under control back to the hip.
- Alternate arms, keeping the wrist locked neutral so the load stays on the brachialis rather than rotating to the biceps peak.
Suggested working range: 10–15 reps. Default progression: double progression.
Common mistakes
- •Curling straight up instead of across the body, which loses the brachialis emphasis.
- •Letting the working upper arm swing away from the side rather than staying pinned.
- •Rotating the wrist toward supination, turning it into a regular curl.
- •Using torso momentum to swing the dumbbell across instead of a controlled forearm path.
Variations & alternatives
Swap in a related movement if equipment, recovery, or progression demands it.
Use this exercise in a program
The Cross-Body Hammer Curl fits naturally into hypertrophy and strength splits that prioritize biceps volume.
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