Sissel Gym ball 65 cm: £29.95
Sissel Gym ball 55cm: £30.95
Sissel SitFit seat 33cm: £29.95
Gym Ball exercise book: £9.99
These training balls help to develop your core stability (your abdominal and low back muscles). They’re suitable for a large number of exercises,which can be done at home or at the gym. They’re also useful for sitting on at a desk. The SitfFit seat is a great way to get the exercise effect on your own office chair.