The XL Iron is the 21st Century version of those earlier fan-shaped resistance training aids. The XL Iron gives you incredible resistance training both in your back swing and through swing while it teaches you to keep the club face square at all times. Because the XL Iron only has one blade versus earlier resistance training aids that had four blades, it forces you to square the club face up at impact correctly every time. The extreme size of the XL Iron’s club face gives you the heightened visual awareness of the club face angle. You will be keeping the club face square while building tremendous power in your golf swing through repetitions with the XL Iron.