The Brachialis is a muscle that sits beneath the Biceps Brachii. By increasing the size of this muscle, not only will you get bigger arms, it might well push your biceps higher in search of the all important ‘Biceps Peak’!
To increase tension on this muscle, and therefore increase mass, opt for Pronated & Semi-Supinated grip movements for curls/elbow flexion. Here’s a workout that encompasses all the principles & stimuli that the Brachialis loves to respond to:
A1) Scott Bench Spider Curl (2″ EZ Bar, Pronated, Mid Grip): 4-6 reps, 3210, 10-15s rest