The Hatfield Strap shoulder strap is placed around the top of one shoulder then under the opposite arm. The shoulder strap is then threaded through the handles of either the calf strap or the sit strap and fastened into place. The user simply sits back to perform the stretch using the core trunk muscles and leverage allowing the user to expend less effort and relax while performing the stretch.
With this strap, the force needed to engage an effective stretch is minimal. Very little effort, maximal stretch. This makes performing the stretch easier and more effective at the same time. A person can actually relax while getting the best stretch of anything on the market.