Add a little "speed play" into your training, following the natural variation of terrain and conditions, and you could find the less-regimented workout has a lot of benefits. Push yourself and keep track of progress with an app like Strava.
HomeTag
fartlek
What could be more fun than going for a trail run or backcountry ski with a primal purpose, like bringing home dinner? Lex Treinen shares his love of what he calls "old school biathlon," a hunting-and-gathering workout off the beaten path.