Hammer Curl
What is the hammer curl?
The hammer curl is a bicep curl variation performed with a neutral grip (palms facing each other) instead of the supinated grip of a standard curl. The neutral grip shifts emphasis from the biceps brachii to the brachialis (a muscle underneath the bicep) and the brachioradialis (a forearm muscle). For trainees building visible upper-arm thickness, hammer curls produce results that supinated curls miss.
Who should do hammer curls?
Most lifters benefit from including hammer curls alongside standard bicep curls. The brachialis grows underneath the biceps, pushing them up and producing more visible upper-arm width. Programs that only train supinated curls leave the brachialis underdeveloped; including hammer curls fills this gap. Beginners can include them from the start of training.
How do you program hammer curls?
Two to three times per week. For hypertrophy: 3 to 4 sets of 8 to 15 reps. The brachialis responds well to moderate-to-high rep work with controlled tempo. Most programs include hammer curls as accessory work after a heavier supinated bicep exercise (barbell curl or dumbbell curl).
Hammer curl vs supinated curl
The supinated curl trains the biceps brachii (which has a supination function in addition to elbow flexion); the hammer curl reduces bicep involvement and shifts work to the brachialis and brachioradialis. Most lifters look biggest in the upper arm when both muscle groups are well-developed; including both grip variations in the program produces this outcome.
Frequently asked questions
How heavy should you go?
For working sets, dumbbells that allow 10 to 15 strict reps with 1 to 2 reps in reserve. Most intermediate trainees can hammer curl slightly more weight than supinated curls because the neutral grip is mechanically stronger. Going heavier than form allows produces the body English that defeats the isolation purpose.
Alternating arms or both at once?
Both work. Alternating allows slightly heavier loads (the resting arm provides counterbalance) and feels more strict; simultaneous curls produce more total tension and finish the set faster. Most programs use simultaneous curls for working sets and alternating curls for high-rep finishers.
What about rope hammer curls?
Rope hammer curls (using a rope attachment on a low cable pulley) provide constant tension throughout the range and allow the hands to separate at the top for an additional contraction. They are a productive variation alongside dumbbell hammer curls; many programs include both.
What about cross-body hammer curls?
Cross-body hammer curls bring the dumbbell across the body toward the opposite shoulder rather than straight up. This variation emphasizes the brachialis and outer-bicep heads more strongly than the standard hammer curl. It is a useful variation for stimulus variation; rotate it into programs periodically.
Common mistakes
- Rotating the wrist during the curl. Maintain the neutral grip throughout.
- Swinging the torso for momentum. Brace the core; reduce the load if needed.
- Letting the elbows drift forward. Keep them pinned to the sides for full isolation.
- Cutting the range of motion short. Lower to a full stretch and curl to the top.
- Using too heavy a load. The hammer curl is isolation work; strict form produces the productive stimulus.
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