Fartlek workouts add variety into your training, but you can also change up how you do them to ensure that they never get old.
However, each fartlek running workout typically is structured as follows:
10 minutes of warm-up pace
1-3 minutes of race pace
1 minute of resting pace
Repeat this 4-8 times
10 minutes of cool-down pace
You can scale the race and resting pace variations depending on how much long-distance cross country running you’re seeking to complete.