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That show is called "Sasuke" in Japan, Doc. :-)
Strangely enough no Olympian has ever beaten the Final Stage.
A 36 year old fishman cleared Sasuke 2 years ago and is still one of the top 1-3 competitors.
On the woman's version (called Kunoichi), theres a spaced out/punk fashion 31-ish lady that owned for few years in a row. She cleared it 3 times when the stage was more difficult, but hasn't participated in the last year+.