Mountainboarding and personal risk

Yesterday I went to Hampstead Heath, to go mountainboarding on the highest point in London, Parliament Hill. After a couple of warm-up runs, we found the hill and I jumped on the board, and in the process of making my way down the hill, I managed to run the blunt front end of the board into my leg. I've been limping ever since, but I can tell that I'm going to enjoy that hill the next time there's a little more room on it (there were a lot of people enjoying the weather) and of course, once my ankle is healed.