Pictures: Tough Guy racers brave mud, water and fire
Thousands of brave men and women compete in the Tough Guy race, running through mud, water and fire in Perton, near Wolverhampton.
But there was no one to help stop this knight from falling into the muddy water...
Oh did we mention having to run through wires that can give you electric shocks? Competitor Nicholas Woods told Newsround: "The electric shocks are brutal, your whole body literally jolts!" DEFINITELY, DEFINITELY don't try this at home!
Is this the toughest race in the world? The annual Tough Guy race has taken place in Perton, near Wolverhampton. This guy is crawling through mud under barbed wire!
There are even burning obstacles to run through - something you should NOT try yourself!
Thousands of brave competitors have to overcome around 200 obstacles while getting muddy and wet!
The course is 15km long but runners can choose a shorter 10km race if they want to.
The event started in 1987 and happens on the last Sunday of every January on a farm.
Or this woman wearing a Viking style helmet!
Even dogs are allowed to come - if they don't mind getting a bit muddy!
This guy needed a bit of help getting out of the mud!
The race is so gruelling that usually around one third of people who start the race don't make it to the finish line!