[Yoda]

Yoda,

I think it is basic anatomy that both triceps and biceps cannot be active at the same time. Is it possible that Right Arm Extensor Action on the backswing is entirely due to right arm fanning?

Scott

Hi Scott,

I am in no way an expert in in human physiology. However, I can tell you that I apply Extensor Action with my Right Triceps and at the same time experience Right Elbow bend (due to the Checkrein Action of the Left Arm).

Since the Biceps bend the Elbow, I can only conclude that it is possible for both Triceps and Biceps to be simultaneously actuated. Maybe someone more qualified can add insight here.