Perhaps re-inventing the roll rather than the wheel. My concern is that other disciplines have, I assume, already created a usable kneeling rule and bag.
If we go down the route of pilates rolls there will have to be some definition of shape and maybe resistance. Just
saying the roll can be up to 15cm diameter does not seem to be working already - the roll Andy is using is a not circular. It has flat base.
Where will this end? Can the roils have a flat top and base? Can they have a recess into which you fit the shin? I just wonder if we go with the rules from another disciple if we can avoid all of those discussions.