Everyday Ultra

Fastest Known Times (FKTs): How to Plan, Train, and Execute an FKT Attempt

Dec 30, 2025
Alyssa Clark, a pro ultra-runner with numerous FKTs, joins Shelby Heinz, a race director known for challenging routes, and Lizzy Fowler, an experienced coach and ultra-runner. They dive into the nitty-gritty of planning and executing FKTs, discussing the distinctions between supported and unsupported attempts. Alyssa shares insights on logistics and pacing, while Shelby recounts her rugged Tucson trek. Lizzy emphasizes the importance of safety, flexibility, and community, revealing how unexpected challenges can shape an FKT experience.
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INSIGHT

FKTs Are A Different Beast Than Races

  • FKTs differ from races in logistics, emotion, and unpredictability rather than just being 'run fast'.
  • They reward creativity, problem-solving, and community as much as fitness.
ANECDOTE

JMT Attempt Ended By Wildfire Smoke

  • Lizzy attempted the John Muir Trail northbound and was forced to stop due to severe wildfire smoke and AQI around 300–500.
  • She accepted the decision, raised money for a cause, and plans to retry within a weather window next year.
ADVICE

Choose The Right FKT Style

  • Do pick the FKT style (unsupported, self-supported, supported) that matches the route and your goals.
  • Read fastestknowntime.com rules because definitions and restrictions (e.g., no drone footage) matter for validity.
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