Yup. Basic anatomy. Levator Scapulae. Rhomboid. Upper Trapezius. Middle Trapezius. Latissimus Dorsi. Sooo many folks say it's all rhomboid. Then, others say it's all the trapezius (mid and upper). So, how about the Latissimum Dorsi? So, how about transverse extension? Sorry folks. You CAN use the latissimus dorsi, for "back tension", when you execute transverse extension, regardless of the rotation angle of the release hand. The rotation angle of the release hand is strictly working your ulna and radius bones in your forearm. Transverse extension = controlled by the following muscle groups: latissimus dorsi, infraspinatus, and teres minor. BUT, the rhomboids also get involved, and the trapezius, as well. Redundant and over-lapping systems. So, to say that the back of your hand, plastered vertical against your cheek, locks out Back Tension is an incorrect statement. Sure, Larry Wise teaches the palm horizontal technique. The other rotation positions (45 degrees or vertical back of hand) ALSO work with back tension. Depending on what muscles you activate, your follow through reaction can be a VERTICAL arc for the Right Handed Release elbow...or, even with a VERTICAL back of hand position, via TRANSVERSE EXTENSION, your VERTICAL Right Handed Release Elbow can have a horizontal swinging motion follow through reaction.