Hi Linda
I am a physio working for the army in Wiltshire, I use the swiss balls a lot & have been for about 3 years now I have recently co authored a manual on swiss ball training with the Bristol Rugby club physio it is available to buy through Premier Sports Medicals, Physical Company or ourselves. I find it excellent for improving core stability & great for advanced training. The army camp where I work love it & I am now getting the P.T.I unit interested, any more info just let me know
regards Barry Edwards