Re: Mike sigman's internal strength parameters- Have you guys read this; really!
Robert John, could probably comment more since I wasn't there, but I remember a kinesiology prof went to see Ark and was rather impressed. As I recall, he said something along the lines that no one would believe him in terms of what he witnessed as the conventional models of movement do not correspond to what Akuzawa sensei is doing. Now I don't recall this gentleman's name or what university he was affiliated it, but this would indicate to me, that this is a difference in terms of the conventional western model of movement and thus it is unlikely that high level athletes are doing what he is doing.
This is second hand of course, so make of it what you will.