You can use a stability ball for performing gym based exercises to help enhance balance, stability and control of deep muscle tissue. Improve posture and support around joints. Greater all round muscle strength, power and endurance. Greater flexibility and range of movement in joints. You can also incorporate other equipment such as dumbbells.
All sizes of stability ball can be found here at Hone gym.
A GENERAL GUIDE FOR STABILITY BALL SIZES
Height: Upto 5′ 6″ / Ball size: 55cm (22in.)
Height: 5′ 7″ – 6′ 0″ / Ball Size: 65cm (26in.)
Height: 6′ 1″ – 6′ 9″ / Ball Size: 75cm (30in.)