Ronan Mc Laughlin, Everesting Record, 6 Hrs 40 Mins, March 2021

Oooo, just thought, you could scoop up water like a firefighting plane at the top of the hill, reach about 100mph on the descent, jettison the ballast just before the bottom, make a U-turn (might have to peddle for this bit) then extend the batwings and get propelled up the hill at about 40mph by an 80mph wind.
Might not be UCI legal.

I’ll shut up now😁