Want to step up to the professional level of Roller Derby? Better watch this first, rookie. It's Alfonso Reyes training San Francisco Bay Bomber hopefuls the "Five-Stride". Master this basic technique of banked track skating, and you might have a chance to become one of the legends of Roller Derby. But you better to be ready to be coached by an "in-your-face" professional who is one of the most aggressive and respected skaters in the history of Roller Derby. If you can gut it out, you just might get on a track with the Stars of Roller Derby. This video is rated R-Language, Sweat and Guts. It’s not for everyone.