

The brachialis also originates on the lower portion of the upper arm bone, and it attaches at the large inside bone of the forearm, called the ulna. This muscle helps to flex the elbow but also gives visible mass to the front of the forearm ( 4). The brachioradialis originates on the upper arm, closer to the elbow joint, and terminates on the forearm, just before the wrist. Namely, it flexes the elbow and assists in flexion of the shoulder. It inserts on the radius bone, just below the elbow.īecause the biceps brachii crosses both the elbow and shoulder joints, it creates motion for both joints. It has two heads that originate at the shoulder joint and a bony prominence on the front of the shoulder blade. The biceps brachii is the most superficial of the flexors and is the most visible mass on the front of the arm. The elbow flexors are made up of the biceps brachii, brachioradialis, and brachialis ( 3, 4, 5). Hammer curls work the elbow flexors - the muscles that bring your hand to your shoulder by bending your elbow.

They may be easier to tolerate than the traditional biceps curl. They’re beneficial to add mass to your arms and can help focus more attention on the short head of the biceps. Hammer curls are biceps curls performed with your hands facing each other. If you experience any pain, then it may be better to hold off and consult a medical professional. Nevertheless, It’s best to perform hammer curls with a light weight first. Sometimes adjusting your forearm position can help alleviate this while still working your biceps ( 2). Injury to the long head of the biceps is a common cause of shoulder pain ( 1). In addition, this type of curl may be easier to tolerate than traditional curls if you’re experiencing shoulder or forearm pain. The hammer curl grip allows more focus on the short head of the biceps. In part because of the neutral grip (palms facing each other), hammer curls have a slightly different muscle activation pattern than the traditional biceps curl, which is performed with a supinated grip (palms facing up). As a result, it’s a good exercise to build strength in all three muscles that bend your elbow.

The hammer curl may help add mass to your arms because the grip positioning often allows you to lift heavier weight.
