Foundations - Fartlek.com

Split image showing a runner surging along a forest trail on one side and a runner striding in lane two on a red track on the other, both lit by warm golden light.

Fartlek vs Interval Training: Key Differences Explained

Fartlek and interval training are not the same thing. Here is a clear breakdown of how they differ, what each one does to your body, and when to use which.

Weathered wooden trail sign reading FARTLEK mounted on a pine tree in a sunlit forest, with soft-focus pines and warm golden morning light in the background.

Foundations

What Does Fartlek Mean? Origin, Pronunciation and History

Fartlek is a Swedish word meaning speed play. Learn the correct pronunciation, the full origin story and why the word sounds the way it does in English.

Lone runner sprinting along a winding forest trail at golden hour, viewed from a low angle with motion blur, warm sunlight filtering through pine trees.

Foundations

What is Fartlek Training? The Complete Guide

Fartlek means "speed play" in Swedish — and it's one of the most effective training methods in running. Learn what fartlek is, how it works, and how to start today.

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