To build the most muscle mass in your arms ... rotate your forearms and bend your elbows. During this movement, you’ll also work your brachialis, deltoids, forearms, and core as you stabilize ...

The hammer curl focuses on the following muscle groups: Brachialis: This muscle is located ... this muscle is activated during the movement, helping to lift the load. Brachioradialis: Located ...

This compound movement not only targets your biceps ... As well as targeting your biceps, the hammer curl also works the brachialis (the muscle underneath the biceps which aids elbow flexion ...