The shoulder, comprised of the scapula, clavicle, and humerus—commonly known as the shoulder blade, collar bone, and upper arm bone—is a highly mobile joint capable of positioning the hand virtually anywhere in space.

The difficulty of the front scale can be moderated by adjusting the height of the leg as well as the duration of the hold. Regardless of the height of the leg, strive to maintain perfect posture and alignment.

The difficulty of the back scale can be moderated by adjusting the level of the torso and rear leg as well as the duration of the hold. Begin with a small bend at the hip and lift of the rear leg. Master the basic position before increasing the range of motion.