Laskiainen (Finnish) = Mardi Gras (French) = Fat Tuesday (English).
In Shrovetide we Finns lap up pea soup and play in the snow like crazy.
Nordic skiing is my usual thing to do this time of year.
I simply love the freestyle. Classic style: not so much - after finishing Vasaloppet 90K years ago in Sweden, I cut my classic skis and burned them in the fireplace.
Now with new skis around that don't require too much waxing, I might return to classic technique. Except skating seems too much fun to give up anymore.
Anyway I skated 25K in fairly nice, slightly too warm weather.
I do recommend cross-country skiing for trailrunners. It's a great whole-body workout and easy on the legs.