By Owen PalmerFartlek training was introduced by Swedish coach Gösta Holmér in the 1930s, and the name comes from the Swedish word for “speed play.” Holmér developed it as a way for runners to mix fast and slow running within a single session, without the strict structure of timed repeats. Today it remains one of the most flexible tools in interval running.
Who Gösta Holmér Was and Why Fartlek Took Off
Gösta Holmér was a Swedish track and field coach working in the 1930s, a period when Swedish distance runners were among the best in the world. His approach moved away from the rigid, stopwatch-driven training common at the time. He wanted athletes to develop speed, endurance, and mental freedom at once, so he encouraged runners to change pace based on terrain, feel, and landmarks rather than a fixed schedule.
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The method spread quickly through Scandinavia and then into broader European and American coaching circles. Its appeal was simple: it required no track, no timing equipment, and no specific distance. Runners could do it in a forest, on a hill route, or on city streets. That accessibility is a large part of why fartlek is still taught in high school programs and club training groups.
It is worth noting that some coaching histories credit related ideas to earlier European trainers who experimented with varied-pace running. Holmér is generally recognized as the figure who formalized the concept and gave it the name that stuck. If you need a citable source for an article or coaching handout, check sports history references from national athletics federations before attributing specific dates.
How Fartlek Works in Practice
The core idea is unstructured speed variation. A typical session might look like a warm-up of 10 to 15 minutes at easy effort, followed by 20 to 40 minutes of alternating pace. The “structure” comes from the runner’s decisions rather than from a clock. You might pick a distant tree and sprint to it, jog to the next lamppost, then surge up a hill before recovering on the flat.
Because the efforts vary in length and intensity, fartlek builds a wide range of fitness. Short bursts of 15 to 30 seconds develop leg speed and neuromuscular coordination. Efforts of 2 to 4 minutes near threshold effort build aerobic capacity and the ability to sustain discomfort. Longer, steadier surges help with running economy. We also found Fartlek Training Method Is Used to Develop (2026): Which Should You Choose? useful on this point.
Typical Fartlek Pace Ranges
Because fartlek is unstructured, paces are relative. The following guide uses approximate effort levels, which you can gauge by breathing and perceived exertion rather than a watch:
| Effort Level | Feel | Typical Use in Session |
|---|---|---|
| Easy | Conversational, nose-breathing possible | Warm-up, cool-down, recovery jogs |
| Steady | Comfortably hard, short sentences | Middle segments, longer surges |
| Threshold | Hard, a few words at a time | 2 to 4 minute efforts |
| Fast | Very hard, breath-focused | 15 to 60 second bursts |
Why Fartlek Still Works Today
Fartlek persists because it solves a practical problem: many runners find structured track workouts stressful, boring, or hard to schedule. The unstructured format lets you adjust to fatigue, weather, and surroundings. A runner having a sluggish day can shorten the fast segments; one feeling strong can extend them. That self-regulation is valuable for building consistency, which matters more than any single hard session.
It also trains mental skills. Deciding when to surge and when to ease off builds pacing judgment, a skill that transfers directly to race day. Many coaches use fartlek during base-building phases and then shift toward more precise intervals as a goal race approaches.
Practical Tips for Your First Fartlek Session
- Warm up for 10 to 15 minutes at easy effort, then do two or three strides of 15 to 20 seconds.
- Choose landmarks in advance, such as trees, poles, or hill crests, so your efforts have natural endpoints.
- Start with conservative efforts. Aim for four to six surges in your first session rather than trying to match an experienced runner’s volume.
- Recover fully enough to hit your next surge with good form, usually one to three minutes of easy jogging.
- Finish with a 10-minute cool-down and note how the session felt for future planning.
- Limit fartlek to one or two sessions per week, and keep at least one easy run between hard days.
If you are new to structured speed work, pair fartlek with a basic plan. Our guide to a Training Plan for a 5K: A Step-by-Step Guide for Beginners shows how to fit faster efforts around easy running. For a more progressive build, see Running 5K Training Plan for Beginners: 8-Week Step-by-Step Guide, which introduces intensity gradually.
What We’d Use
A simple set of training cones helps you mark fartlek segments on open ground without relying solely on landmarks.
- A set of agility training cones for marking surge start and stop points on a field or park path. View on Amazon
- A GPS running watch with interval alerts if you want optional pace feedback during fast segments. View on Amazon
Related Questions
Is fartlek the same as interval training?
No. Interval training uses fixed distances or times with planned recoveries, while fartlek is unstructured and driven by feel and terrain. Both build speed, but fartlek offers more flexibility.
How often should I do fartlek?
Most runners benefit from one or two sessions per week. Space them with easy runs between so you can recover and adapt.
Can beginners do fartlek?
Yes. Beginners should keep fast efforts short, reduce volume, and focus on controlled effort. You can also read Run a 5K Training Plan: A 6-Week Guide for Beginners for a gentler starting point.
Do I need a track for fartlek?
No. Fartlek works on roads, trails, grass, and hills. That flexibility is one of its main advantages.
Should I consult a professional before starting speed work?
If you have a heart condition, joint problems, or have been inactive for a long time, consult a doctor or qualified coach before adding fast running to your routine.
Related reading
- Running 5K Training Plan Intermediate: A 6-Week Speed Build (2026)
- Nike Running Club 5K Training Plan Review: Is It Worth It?
- Nike Run Club 5K Training Plan Review: Is It Worth It?
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About Owen Palmer
Owen Palmer is part of our editorial team and reviews and edits our speed & interval running guides, checking product details against manufacturer specifications and owner feedback.
