Did that fartlek workout lead to a major bonk instead of runner’s high? Need a glossary just to understand what we’re talking about? We demystify some of the most common running terms.

Bonk

Verb: To become utterly exhausted and depleted and unable to keep moving forward at a desired pace. This occurs when your glycogen stores are depleted.

Example: “I didn’t think I’d bonk so hard during the race, but it felt like I hit a brick wall and my legs were made of concrete.”

Triathlete: Running vs. triathlon running

Fartlek

Noun: A Swedish word that means “speedplay.” A run where you speed up and slow down several different times during the workout. You must keep running during the entire workout for it to be considered a fartlek.
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