The 4kg Fitness Mad Slam Ball is a good way to introduce explosive training into your strength or cardio workout routine. Designed not to bounce, this sand-filled, PVC-covered piece of equipment is designed to be thrown onto the floor or against a wall. By doing this you will be exercising, toning and strengthening practically every muscle group in your body including your arms, legs, core and back. Ideal for boot camps and circuit training, this will boost your cardiovascular fitness, improve your stamina and co-ordination and increase your flexibility.