The reebok mens training 65cm gym ball is a highly versatile fitness aid that can be used for performing a huge number of exercises and improving a number of aspects of your fitness try doing tricep dips lower ab crunches shoulder curls press and side squats or even the plank and use the included workout dvd to inspire and motivate you further work on enhancing your core strength flexibility balance posture and general fitness and do so in confidence on this swiss ball made from hi den