![Photo: John Segesta](http://cdn.triathlete-europe.competitor.com/files/2015/12/fartlek-300x189.jpg)
Photo: John Segesta
If you’re getting bored with your predictable track sessions, it’s time you mixed it up with a fartlek workout—a creative,
Photo: John Segesta
If you’re getting bored with your predictable track sessions, it’s time you mixed it up with a fartlek workout—a creative,