XC skiiers in particular need a sport for their "off season".
Speed skaters too. Lots of speed skaters use cycling for cross training, and there are many instances of speed skaters crossing over to cycling, and vice versa. Eric Heiden competed in cycling for a while after his speed skating career, and Chris Witty was competing in both until just recently, when she left T-Mobile to concentrate on speed skating. Dede Barry started out as a speedskater, took up cycling for cross training, started competing in cycling as well and eventually chose to concentrate on cycling.
- Jo, factoid collector