Recently I did a Tough Mudder - a 12 mile run with about 25 obstacles. The beginning wasn't bad. We had some hurdles to hop over, a giant trough of waist high ice-cold water, muddy hills, a smoke filled path and some walls to scale.
Then we had to do a 25 foot jump into some freezing water. It was in the 50s with no sun and slightly windy; making everything colder.
It had been a long time since I've done a dive and I froze as I fell into the water. And then the mud really began. It started off not too deep, but then slowly built up.
Falling back I turned my head a little too much and got my ear covered in mud.
It took about five minutes to get my ear cleaned out on the inside after I got home. Part of this obstacle were mud filled holes about chest high. It was slick.
At least I didn't get my head fully covered.
The mud did not stop. I'm not sure how many times we had to run through it of differing heights. Sometimes it was just around the shoes, sometimes up to the ankles, sometimes knee high. The hardest obstacle had small hills - about 4 feet high, followed by a drop into a mud filled ditch about 4 feet high. There were more than a dozen of these all in a row. It was slick enough that in some places you couldn't make it up on your own; you had to have someone pull you up or push you out.
We then had a rope obstacle. It didn't look that hard; but the ropes were heavy and pulled down on you meaning you had to crawl on rocky mud covered ground. There were pins all over the ground as well that fell off people's shirts (that attached our numbers).
We then slid down tubes into water with barbed wire over our heads at the bottom.
We had to crawl up a tube, which didn't sound hard but there was no traction and it was covered in muddy water. We had to waddle up on our arms like a seal since our legs were useless. There were more boards to scales, monkey bars with water underneath if you couldn't make it (I survived one of the two), a long and shaky balancing beam with water underneath (I made it), hills covered with mud, crawling underground in a dug out tunnel, hopping over and under logs, going through a river, climbing up and down rocks, more mud and yet even more mud. There was climbing under barbed wire in mud as well as climbing under wire that was wired to give an electric shock if you got hit. I got a tiny zap. The last big obstacle was a half pipe we had to scale. I got close enough on my first try that the people at the top could pull me over.
Once this was scaled, it was a run to the end where there were more electric shocks waiting. Some how I made it.
No one obstacle was overly difficult, but over 12 miles they got progressively harder as I got more worn out. At the end I was dead and freezing. I used up all of our hot water taking a shower trying to get clean after I got home. Now I'm ready for next year.