I have been riding all my life. Yesterday my buddies and I went up to Drexel, MO. It seemed like everyone had fell atleast once. I hit a downhill double that I had hit atleast twenty times. Third gear wide. Bike went vertical, didnt even think about the back brake. Came down with the back wheel first. Slammed the front down, went off track into some brush that I couldnt see what was underneath. All the sudden Im flipping face first over the bars. Bike lands on me. Then I flip again and the damn thing lands on me again. MAN DID IT HURT. I thought I broke my back. But didnt. Cant even sit up on my own now. Just want to know how to prevent the back tire from hitting the ground first like that? Do I need to position myself differently? I have yet to learn to use the back brake, think thats my problem? I hate going vertical like that. Maybe suspension?