Matt Gauthier explains the Invert Backside 50 50 body roll.
“50 50” comes from the fact the its uses only 1 arm, or only 50% of what a normal body roll would use. It’s “invert” because the trick is started with your back facing the wind. And it’s “backside” because it goes behind your head, like a back roll.
This trick is one of the more advanced body rolls. I can hardly describe it so watch to video to see how it’s done.