I think Clavel's position is a factor of him being on the long, gradual downhill. I actually did the same thing (scoot butt backwards and assume a mild superman position) but didn't pedal too much.
I am really not sure how Butterfield's prostate is still intact given his saddle choices and riding positions.
I am really not sure how Butterfield's prostate is still intact given his saddle choices and riding positions.