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Step 1: Get a skateboard
Step 2: Go down steps >>
more like, 1.) take skateboard, 2.) attach piece of wood/plastic/insert material here that is roughly 1 foot wide x however long your body is, 3.) lie head first on board, and 4.) push down stairs
But seriously, i'd assume bobsled places would have them. also, consider the fact that you go, head first, at high speeds, on ice courses....not many places would accomodate (or afford the insurance premium) for a sport like that