Analysis of a Motion During a Daily Activity

One of the most common actions, or movements, I do almost every day is straightening my hair.  The major joints used during the act of using my straightener are the shoulder, elbow, and wrist joints.  When I go to lift the straighter towards my head, my shoulder moves in both the sagittal and frontal planes, making my shoulder also move along both the frontal and sagittal axes.  My elbow moves mainly along the sagittal plane and frontal axis, while my wrist joint moves about the sagittal plane and frontal axis to twist the straightener along my hair.  In terms of arthrokinematics, the shoulder joint spins about the ball-and-socket mechanism, giving it the ability to move within all three planes.  When the elbow is flexed to lift the straightener up, the primary mover is the biceps brachii, which concentrically contracts when the elbow is flexed.