This is something my friend and I used to do as we cleaned up the jumps in the arena. You sit on the block and pull it forward and ride it downward then repeat until you are at the finish line. I just had to show Brittany and Camille this at our horsey movie night and they got a kick out of it. Here is the video. Camille didn't figure it out til after the race lol.
Jump Block Races - YouTube