I thought he was a she - why is he wearing a bikini?

When you ride with his power, you're practically standing no the pedals anyway, so there's likely not a whole lot of pressure from the seat.

I ride that far forward during hard sprints, as well without problems. I just can't do it for more than 15 mins at a time before my legs blow up and I have to put my weight back on the seat.

Nah, it's just called bike fitness.