SPECIFICATION 
  Material: Dual texture rubber for extra grip
  Diameter: 19-29.5 cm
  Size: 2-50LBS 
  Filler: thick rubber wall  
  Colour: green, black,blue,red,yellow,grey
  Available in different colours and weights

The ball sits well in your hand and provides a good grip due to the special surface structure. You can use the ball to intensify already known exercises by adding extra weight, for example by taking the ball in your hands during a normal crunch or by placing it under the arm during push-ups. There are also many exercises that can be done specifically to train new muscles with a medicine ball.