I've never had any serious injuries whilst taking part but I have ended up with some hellish scratches and gouges on my arms and legs.
- That muddy water is quite nasty indeed, you and few thousand other people tracking their muddy shoes and selves into bodies of water, will make it a stew you really don't want in your eyes or mouth. I ended up with a sinus infection from one event, which isn't pleasant in the slightest as it stinks every time you breathe in.
- Island hopping had me knocking myself out when I landed badly and ended up taking a header into the water with a smash to the knee which gave me an issue running, the final few hundred yards, up an incline.
- Some of the crawl obstacles are nice and muddy, some times they are like crawling across a car park, which is where you will get most of your cool as scratches from, nothing says you've done Tough Mudder like arms and legs that look like someone took a cheese grater to them.
- Everest is a large apparently greased quarter pipe that you need to run at a steady but reasonably quick speed to get up and if you slip and fall back and land on the surface you will feel it in your upper and possibly lower back, I had to skip this one after I landed heavily for a forth time and knocked myself out of sorts and ended up feeling dizzy and spaced out.
- The killer of any running event, cramp, I've had this several times, when taking part and it isn't pleasant, as anyone who has had it in their calf or other part of their leg, it will if you're really unlucky put you out of the event, or even just stop you being able to run any further, either way the cold water or the deep mud can set this off and being in either of those places can leave you in pain for longer than is bearable, I even managed to get it trying to clear hangover walls at one event last year.
- I spotted someone crossing the finish line with blood streaming down their forehead.
So that's a few of the somewhat unpleasant things aside from cold water, mud and shocks you will find at an event, don't let them put you off, I've only been hurt occasionally and nothing that was permanent.