Yes, it is expensive but I see it as an investment in myself as I'm about to hit my 50th birthday! I didn't expect to be able to get my body back into a reasonable shape and I never imagined I'd find myself running on a treadmill but esph is getting me there. The physios are very encouraging but also very firm - understanding why I need to build up certain muscles to avoid injury is a further incentive to put in the work and if it means avoiding a hip or knee replacement in 20 years time, it's worth every penny.