Being Wanless-ified

So my trainer audited a Mary Wanless clinic, and has been using all these new tricks to torture me... uh, make that make me ride better.  My stirrups have been shortened one hole (she threatened two, but thankfully reconsidered!) and I've been working on riding in a positions that feels so alien - aiming to ride with almost a permanent "heels away" position.  The key for me, though, is working on rotating what Wanless calls the spiral muscle in the pelvis/leg (actually the sartorus).  Doing that really helps release something in my seat, and allows Indy to expand so much more at the trot... so much so that I can barely sit it, but I'm working on that part!  It's fun and this method seems to really click for me.  Being not exactly gifted in the athletic department naturally, I sort of need all the help and theory and explanation I ca get!