If you have a weak core or want rock hard abs then this is the ultimate in core stability workouts. Also great for plyometric exercises, which develop the muscle's capability for speed & explosiveness. Ideal for injury rehab or better still pre-hab(prevention) Rubber compound core stability training ball. Dual handles make the balls much easier to grip for flexibility, agility and fitness training. Comes with a full colour, double sided exercise wall chart providing comprehensive instructions and correct exercise technique at a glance This would be a fantastic addition to any home or gym, it offers so many exercises for so little money, add this to a swissball/gym ball and you have endless combinations.