Check out the SKLZ Gold Flex golf swing trainer warm up drills from Boyd Summerhays, Coach to PGA Tour Pros and PGA player Tony Finau. The SKLZ Gold Flex golf swing trainer comes in two sizes of 40" or 48". The 48" is designed for golfers 5'4" or taller. Both SKLZ Gold Flex golf swing trainer sizes improve swing tempo, strength, and flexibility. The exaggerated flex in the shaft helps lengthen your swing by keeping your hands and arms extended increasing with power. Keep one in your bag for warm up and temp training!