Multi-Sport Races

Swim, Bike, Run. These vary from "Try-A-Tri" all the way to the famous "Iron Man" distance.

If you take out the swim from a triathlon and Run-Bike-Run, you have a duathlon. Some people don't want to swim, and sometimes Triathlons cancel their swims due to weather/water conditions.

I haven't tried these, but there's no bike, and you pretty much switch from swimming across a body of water to running to swimming several times. You take your shoes with you.

If the running is on trails, and the bikes are mountain bikes, this is the event.

A famous winter sport. Cross-country skiing is a demanding endurance sport, and right when your blood is really pumping, you have to be calm and still to target shoot with a rifle.

Run in the snow, mountain bike in the snow, then cross-country ski.

Like a summer biathlon - trail running and target archery in one event.

Adventure Racing is an outdoor endurance sport for teams including a combination of mountain biking, trail running/trekking, paddle sports (kayak/canoe/raft), and map and compass navigation.

Another unique event in Quebec City. Bike, run, cross-country ski, ice skate (!) and snowshoe.

I've had my eye on this one for years (there used to be a Canadian event, but this one is close to me, so maybe one day soon). It's a team relay and takes some organization as you descend from the mountains to the sea - cross country ski <-to-> downhill ski <-to-> run<-to-> road bike <-to-> canoe <-to-> cyclocross bike <-to-> sea kayak. Cyclocross could be considered a multisport event in and of itself, since it often involves dismounting from the bike and running with it (sometimes over obstacles).