Take your Body to the next level of strength and fitness with the revolutionary fitness tool guaranteed to - activate your torso for sensational tone and definition strengthen your spine for a pain free back improve your posture develop core stability.

Strong to the core means a dynamic strong lean body. Lisa Westlake introduces you to the fantastic benefits of training on the ball.

According to Lisa Westlake, using the ball is a great way to strengthen the deep abdominal and back muscles which support the whole body. Strengthening these muscles increases what's known as core stability, which can help guard against back injury, improve posture and increase mobility and flexibility.

"Even sitting passively on the ball, you have to concentrate on using, and therefore strengthening, these deep muscles that support the spine to keep upright," says Lisa.

"Core muscles are so deep inside that they're hard to feel and impossible to see, which may mean it's hard to isolate and use them effectively - the temptation is always there to use the rectus abdominus or 'six pack' and other outer layer muscles instead. With time and practice, using the ball helps you to recognise and activate the core muscles.

"The beauty of the ball is that it can be used for such a diverse range of exercises, from simply sitting to gentle stretches, right through to very challenging strength-building exercises."