There is a 3 part team race that some of my friends do that sounds pretty fun. You get two people, and you have to stay together the whole time. I think you start out swimming, then mountain biking, then orienteering, then finally running. The challenge is that if one person is the better runner, while the other person is the better mountain biker, you have to still stay together the whole time. I guess there are four parts. Either way, it sounds pretty fun. My friend said that a lot of people would totally screw the pooch on the orienteering part of the race.