We have some wyckid story tellers here

But sorry... backwards endo? end-over-end? bike goes backwards and then shoots forward leaving you on your endo?

And when Corsair mentioned a "Backendo" all I could see were rows of Pokemon and Digemon and I am wondering what Backendo looks like - assume it wears a helmet and superpowers of flipping? spinning? and it evolves into something with wheels?