Looking at many of these foundation exercises it's very easy to miss the subtle intricacies of what seems a very basic move, partly because the athletes performing them are so physically well prepared (all credit to coach!) and make them look easy. I skipped these by using a bit of momentum and completely misunderstood the importance and function of the skiers iM - thought they were mainly for the knees, but missed that they're actually an ankle preparation also.
I've now gone back, re-tested for mastery and failed abysmally due to poor flexibility in the ankles - I needed 8 small mats......shocking mobility!! Ego hurt....but resolved to nail this now if it kills me. I can do the iMs up to PE3 funnily enough. Lesson learnt not to skip and have gone back to the start on EVERYTHING to retest and prove mastery.