This is pretty amazing. Camera-work is not what I could call "Hollywood-quality", lol, but a really amazing downhill course these guys are going down, over LITERALLY THOUSANDS of stairs, around corners, and through houses. Fun stuff. No guts, no glory, eh? Would you ever do this?? Post your thoughts below. Legendary mountain biker brothers Dan and Gee Atherton go for a ride through Dona Marta slum in Brazil. The course was designed and built for the unprecedented Red Bull Desafio no Morro race.