OK, this one's a bit of a cheat; not all of us have a bog in our backyard. But if you don't, don't think you're banished to staring wistfully out your window as you dribble your soccer ball in your living room.
Swamp football started out in Finland, where it was used to train military personnel and athletes. Why? Well, sprinting in the mud adds resistance, works different muscles and is going to get you in shape fast. It was only a matter of time, of course, before people started seeing the fun of playing soccer in the mud. The actual rules to swamp football -- and there are rules, as well as tournaments held around the world every year -- are fairly similar to a six-person-a-side soccer game. And while it must be fun to have a swamp in your backyard, for those of us who don't, the rules just call for a sopping wet pitch.