Why CoreX? Work Your Muscles. Not Your Joints & Tendons! The CoreX Versa Bodyweight trainer is designed from the ground up to work your muscles, not your joints or tendons! Conventional bodyweight trainers can be harsh on certain joints or tendons primarily caused by the angular force exuded when undertaking upper body exercises derived from a narrow starting point that creates a V shaped strap. Not CoreX. The CoreX design team developed a revolutionary wide cambered head that significantly reduces workout angles. The result is a workout that is easier on key tendons. Further, CoreX uses innovative, bespoke, handles (CoreXSpinFee). These handles are ergonomically design to fit the cusp of the palm and spin with less resistance than competitor offerings. The handles are dual molded. The inner mold is made from compressed nylon which is much stronger and more durable than plastic handles. Feels better too. The grip mold is a highly durable and comfortable rubber, finished in an old school milk bottle design. An integrated door anchor is designed within the attachment strap for home usage without the need of swapping straps or a separate attachment. Non door mounting can be attached carabiner free (looping over), or attached with supplied carabiner that enables multi anchor adjustment points. CoreX is portable, weighing an astonishingly light 1.15kgs (2.55 lbs) inclusive of integrated door anchor and fits within supplied mesh bag.