The REEP adapter is designed to maximise your training radius and allow you to perform a variety of new exercises. It is used for many biceps, triceps and shoulder exercises that require some flexibility in the position of the pull weight. This “sling” adapter creates what is known as a triangle of forces, which distributes the force evenly on the SZ adapter and the ring in the wrist strap; what's more, this adapter complements the lock adapter almost perfectly when using a pair of Eragrips.