well lets see if this works, a friend of mine (blake the oen in black leathers) made a video of one of our local hills, its not a super fast hill but it does have very little traffic as it just ends on a gravel road that is access to hiking and mnt bike trails and its is quite long at 4.2 or so km long, so usally a good 4-5min ride.
anyways here it is
oh im the buttboarder in the second half of the video, didnt realize how much you actually move your head on a buttboard