The reebok womens training 65cm gym ball is a top gym accessory that lets users perform a great range of exercises to enhance core strength flexibility posture balance and overall fitness some possible drills would include tricep dips lower ab crunches the plank shoulder curls and press and side squats and the ball is supplied with a pump and a workout dvd to get you going the grey swiss ball has a 65cm 256 diameter and is made for users between 170cm and 185cm 669 x 728 t