On a flat table are the breasts compressed and the torso lifted. This makes the back and shoulders rounder and the shoulder blades more outward. The connected muscles are tighter and more difficult to work with, deeper layers are less accessable.
|The breast cut out ensures that the back is straight, the shoulders less roud and the shoulderblades closer together. This makes the muscles in the upper back shorter, more flexible and easier to work with. Better results with less effort for the massage therapist.