I wrote a feature about the KF years ago, and visited the army PE Instructors' training ground where the assault course sections were filmed.
It was a real eyeopener!
The bit where they run along a plank and jump down looks really small, but TV distorts everything - it's actually the height of a first floor window!
And the final run-up, which looks like a gentle slope on TV is about a 1 in 4 gradient.
They offered me a chance to have a go, I wisely refused - I knew that contestants undergo a few week' training to get them fit enough, before they attend the filming.
Apparently the previous week, they had a journalist from the Mirror who was foolish enough to take up the challenge - when he got to the end, he threw up, then fainted!
I asked the Sargent Major, who was a couple of inches shorter than me, but built like a brick outhouse, why he shouted at everyone as they went round the course?
He advised me that because they are so full of adrenaline, they can't actually hear unless he shouts.
I asked what happened if they froze when it came to the big drop?
"That's when I stop shouting, and start talking nicely." he replied with a smile.