Though the biceps are a two-headed muscle, most guys have a single-minded focus when it comes to training them: grow mutha*****, grow! With all the curling that goes on in most gyms, you'd think every ...

Though the biceps are a two-headed muscle, most guys have a single-minded focus when it comes to training them. With all the curling that goes on in most gyms, you’d think every gym rat would have ...