Standing Tricep Extensions: Stand with your hips shoulders width apart and place one foot back about shoulders width and a half from the front heel. Keep the knees slightly bent and lift the elbow up that is on the side of the rear leg so that it is parallel to the floor and close to your side. You should be leaning forward slightly and resting the opposite hand on your forward leg. Your elbow should form a 90-degree angle when holding the weight; begin to extent backward focusing on the contraction of the tricep muscle.

This exercise can be done with a rotation of the wrist so that the weight turns form the vertical position to the horizontal before the arm is fully extended. View 1

This exercise may also be done keeping the wrist vertical through out the entirety of the extension. View 2