Fartlek, Interval, and Tempo Runs: What's the Difference?

I don't know about you, but I hate math. So when I read articles about tempo runs and interval workouts that require me to calculate percentages of my half marathon pace multiplied by the inverse of my lactate threshold, I start to zone out.

That's why I love this calculus free introduction to speed workouts by Coach Jenny Hadfield. She breaks down the difference between fartlek, interval, and tempo workouts in a way that even this mathophobic runner can grasp.

So put down your slide rule, read this article, and go for a run.

What's the Difference Between Fartlek, Tempo, and Interval Runs? by Coach Jenny Hadfield