Triceps force versus perpendicular load Hold your arm straight out in front of you so that it is parallel to the ground. Turn your palm medially (center of your body). Now bend your elbow to a 90 angle, so that your forearm is across your body. With your other hand, pull your palm toward your body as you keep your elbow bent at 90 (like a sideways triceps extension). You should feel tension in your biceps. Plot force in your triceps versus the force with which your other hand is pulling. Don't worry about numbers; plot the general trend