I did a "boot camp" 5k.
It was a 5k with the following obstacles:
Tire carry 400ish meters
Bear crawl through a sand volleyball court
Three (3) A-frame climbs
A trail run
Perpendicular wall climb
Rope wall climb
Over-under on rails
And a big cargo net climb
I took 7th on my age group and 19th overall - out of around 180 people. It was fun!
"Doo Doo Doo Doo Doo! That's Jacktastic!"