we are working in aberdeen and have used the swiss ball routinely for progressive stability work for a few years now. we have recently done a pilot study on Wikipedia reference-linkmri and recruitment of multifidus following exercise with encouraging results, and now hope to progress that with a larger group and using an upright more functional scanner. Generally we have found patients find the ball exercise easier than the commonly prescribed 'stability' exercises , but care must be taken on starting levels and progression. Static trans abs etc we find are good in the extremely unstable population. It is also a great home trainer.