Emg Analysis and Muscle Activation: Do Bicep Curls Actually Grow Forearms?
By Alexander Ross
If upper forearm thickness is the objective, lifters must reorganize their programming around joint angles that maximize brachioradialis recruitment.
Hammer curls alter the angle of insertion, allowing the brachioradialis to produce peak torque midway through the arc. This positioning simultaneously overloads the brachialis, a muscular wedge that sits deep beneath the biceps. Hypertrophy in the brachialis pushes the biceps upward, widening the total appearance of the mid-arm while creating visual continuity down to the elbow crease.
Reverse curls using an EZ-curl bar or straight barbell amplify this effect. With the hands fully pronated, the extensor carpi radialis longus and brevis fire vigorously to maintain a rigid wrist position against gravity. Lifting weights with a pronated grip prevents wrist collapse, training the posterior forearm muscles that standard curls largely ignore.
Alexander Ross has covered the video game industry for a decade, writing deep dives on game design, esports tournaments, VR developments, and gaming culture.
