This Is Carpet Boarding

Carpet Boarding is typically used for practicing ollie tricks without having to worry about your skateboard shooting out from underneath you. . Most people think that busting ollies while standing still is a lot harder than while rolling, but practicing like this can help your body learn how to do it.

Pretty much the worst thing that can happen to you is you land on the edge of the board and roll and ankle so you can still slam but it minimizes the chances of that happening.