Going downhill you can lift your legs and be flying like superman.
Not sure I trust the structural integrity of that shape though.
The arch is one of the most stable structures, but I'm thinking your legs will keep getting in the way when drifting.
Your balls might get in the way as well.
This is way better than the other one:
http://www.youtube.com/watch?v=a18xWp0cLHg
That would be hilarious if I was 50 year old lady who worked in a cubicle.
Where the hell can I find this.
Besides the obvious, I mean.