We've long known about GoRuck's military-tough gear — but what we didn't realize is how they test it. The GoRuck Challenge is your invitation to see this testing up close, while testing your own mettle at the hands of a Special Operations combat veteran. Lasting anywhere between 8 and 13 hours with events scheduled all over the country and beyond, each challenge sees you and roughly 30 other participants go through drills, perform exercises, and complete missions in an effort to not only challenge yourself but help your teambuilding skills by making you part of one. Already done the challenge? Try your hand at the Nasty, a six-plus mile course with over 20 obstacles, designed by US Special Forces. It's limited to 3,500 participants, and is followed by a massive party featuring tailgating and tons of $1 beers.