S.I.N. Cycle’s “Our lives are going downhill fast” S2 Gravity Bike. It has a riding position a little like a Grand Prix motorcycle (check the low “clip-on” style handlebar at left). The rider kneels on the little mid-bike platform and rests his feet on the rear-axle pegs. (You’ll see.) Then he points it downhill.
Here’s a spiffing YouTube video of an earlier S1 taking on a run “called Hellway. Starts at The Portland Zoo ends at Goosehollow Max Station down hwy 26. The max takes you back up into the hill then an elevator shoots you up to the top – it’s perfect.”
Thanks and a tip of the bucket hat (not what you think) to Tom Brown.