That's a photo that has interested me. We can see that the rider is a bit blurred, we can't see the spokes at all, yet we can clearly see his cranks and pedals. Of course the problem with that position is how to get one's feet back in the pedals. This photo suggests, IMO, that the cranks were somehow immobilized for this stunt.

Has anyone ever tried this? The saddle is extremely uncomfortable. Large, hard foam pad there? Good lower back musculature for sure. Kudos on that. The aero helmet combined with the sandals and inappropriate other attire is way over the top, though. Rather spoils it, IMO.