Hi runner 66 have a question for you since you have used one. How does the Vasa account for body rotation in the stroke? It seems to me one would be ingraining a totally flat body by practicing the catch/pull on a level body surface? That or one is forced to internally rotate the humerus to accommodate the lack of rotation? I guess my question is: do you swim with some amount of body rotation in the water and if so, how did you adapt to the Vasa in that event given that you are laying on a flat surface? Curious to know how/if you were able to rectify this if it was an issue. Were you able to get from the Vasa to water and have the stroke feel the same? I'm sure there is a trick to it, but I would feel lost trying to swim flat as weight shift provides a good deal of my propulsive power when timed with the recovering arm accelerating down into the catch.