It's come to mean riding structures like skinnies, ladder bridges, trannies, logs, as well as doing drops and jumps. Though even without the man-made obstacles, it's simply going "out of bounds" as Kona calls it; going way out there and finding new not so obvious lines by riding natural obstacles such as rock drops, logs from fallen trees, natural drop offs and steep rooty, rocky nasty sections that traditionally would seem unridable or be avoided. The North Shore in North Vancouver is considered the birth place of the movement due to tough riding conditions, even without the man-made objects. Just taking the trails and avoiding all the stunts is brutal on the bike and rider. Therefore the development of bikes like the Stinky, made for abuse and with lots of plush suspension.