Exercise balls, also called Swiss balls, can be used for strengthening the core muscles, as well as a variety of exercises for arms, shoulders and legs. Or you can even use it as a chair to help improve posture and core strength. Justsports anti-burst exercise balls are made from durable PVC material to increase strength and safety. Anti-burst balls will not explode like a balloon, however, they can still tear or puncture on sharp objects. Choosing the right size ball for your height: Height up to 152cm
- 45cm ball 153cm to 172cm height
- 55cm ball 173cm to 182cm height
- 65cm ball 183cm and taller
- 75cm ball (Note that this is just a guideline and some people may prefer to use a bigger or smaller ball.) What's in the box 1x ball, 2x plugs