I really enjoy cross-country skiing in the winter.
That's awesome, I do too! I love the rich history behind it, there were Norwegian army units skiing for sport all the way back in the 18th century.
Why did the units ski?  Were they on patrol?
Yes, they had ski patrol units that provided medical, rescue, and hazard prevention services. It's neat how there are multiple ways to ski, whether for fun or to accomplish something!