Grab the cross-country skis and try winter triathlon or duathlon! Winter triathlon, the run-bike-ski cousin of swim-bike-run is a great way for multisport athletes to spend time outside in the fresh air during the traditional tri offseason. While the winter triathlon consists of three legs, the witner duathlon includes run-ski. A growing multisport discipline, the cross-training benefits of winter triathlon training are numerous and the fun factor is multiplied! Winter triathlon involves cross-country skiing, biking (most commonly with a fat bike) and running — all on the snow. Find a Winter Series event near you today! Read more below to learn all about winter triathlon and duathlon.