Endurance Unlimited

TrainingPeaks

Dial in those workouts with deep insights and cutting-edge science from the most prominent voices in the endurance and hybrid sports world. Whether you're a triathlete, cyclist, runner, ultra-endurance athlete or coach, and many other sport types, subscribe now to learn how to train for success. Endurance Unlimited is your endurance training resource. To learn more about how TrainingPeaks can help you achieve your training goals, visit us at trainingpeaks.com.

  1. 4D AGO

    Transform Your Training with Smarter Sleep: Insights with Charlotte Edelsten

    Host Dirk Friel is joined by sleep researcher and sleep coach Charlotte Edelsten, whose expertise is backed by over two decades of research on sleep and performance. Together, they dive deep into the science behind sleep for endurance athletes—addressing why sleep is a true foundation for training adaptations, injury prevention, and race-day performance. Charlotte Edelsten shares insights from her years conducting research at high-profile endurance events like UTMB Mont Blanc, unpacks why many athletes struggle with sleep quality (even Olympians!), and dispels myths about supplements and wearables. She discusses practical strategies for managing sleep during training and competition, including napping protocols, sleep banking, and how to optimize rest at altitude or before an ultra-endurance race. 00:00 "Endurance Training & Sleep Insights" 03:37 Sleep Disturbances in Athletes 09:10 Caffeine: Adenosine Blocker Explained 11:10 Limitations of Sleep-Tracking Devices 13:21 "Sleep's Impact on Athletic Performance" 18:46 "Understanding Sleep Through Sleep Diaries" 20:54 "Supplements Won't Cure Sleep Issues" 26:07 "Pre-Race Sleep and Mindset" 29:18 "Sleep Strategies and Performance" 31:01 "Gradual Sleep Extension for Athletes" 33:39 "Strategic Napping in Sports" 37:39 "Optimizing Sleep for Best Rest" 42:09 Sleep's Role in UTMB Success 43:49 "Fatigue Management for Runners" 47:42 "Caffeine Strategies in Training" 50:51 "Hallucinations From Extreme Sleep Deprivation" 55:12 "Endurance Unlimited: Follow & Train"

    56 min
  2. 12/23/2025

    Inside Cam Smith and the USA Skimo Team's Road to the 2026 Games

    On this episode of Endurance Unlimited, host Dirk Friel sits down with rising star Cam Smith, professional trail runner and ski mountaineering athlete who's just qualified for the 2026 Winter Games in Milan Cortina. Together, they dig into the strategy and preparation behind Team USA’s dramatic World Cup victory in Solitude, Utah—which not only put the U.S. a ticket to the Games for Skimo, but also set the stage for what’s next in this fast-evolving sport. Cam Smith shares his journey from ultra-endurance races to the high-intensity, quick-transition world of ski mountaineering, offering a behind-the-scenes look at the training philosophies, mistakes to avoid, and the unique demands of mixed relay competition. You’ll hear how he leverages both running and skiing to fuel his performance, and get an inside look at how emerging talent like Anna Gibson is shaking up the U.S. team. 00:00 "Mixed Relay Racing Strategies" 03:32 "Qualifying on Home Soil" 07:50 "Trail Running Meets Skiing" 12:44 "Balancing Racing Seasons and Goals" 15:41 "Short Turnaround: Leveraging Speed" 17:45 Training for Steep Mountain Racing 22:48 "Injuries, Adaptation, and Focus" 24:39 Future Trail Racing Plans 29:30 "Building a Strong Skimo Team" 31:26 "Join Our Thriving Federation" 36:50 "Pacing Strategies in Racing" 38:38 Downhill Training for Racing Success 43:02 "Post-Season Training Reset" 45:19 "Skimo's Impact and Future" 48:40 "Inspiring the Next Generation"

    51 min
  3. 11/20/2025

    Mental Fatigue and Neuroplasticity with Scott Frey

    Host Dirk Friel sits down with Dr. Scott Frey, author, neuroscientist, and psychologist, for a deep dive into the critical role that the brain plays in endurance sports performance. Scott Frey explains how the brain is the "central command and control center" for both physical and cognitive performance, and how neuroplasticity—our brain's ability to change—offers untapped potential for athletes. Scott breaks down how mental fatigue impacts physical output and why neglecting “brain tapering” could be holding you back on race day. Discover the science behind neuroplasticity, actionable strategies to regulate stress and arousal, and why even top performers may be leaving “low-hanging fruit” on the table by not deloading cognitive stress before big events. Whether you’re coaching, competing, or striving for your personal best, this episode is packed with insights and practical tips to harness the power of your brain for peak performance. 00:00 From Running to Brain Research 06:11 "From Science to Sport Mastery" 13:48 "Optimizing Performance Through Neuroplasticity" 20:44 "Brain's Role in Workout Performance" 23:13 "Tapering Cognitive Load for Athletes" 27:17 "Training Decision-Making Under Fatigue" 36:13 "Rethinking Brain Training Methods" 38:15 "Training for Resilience and Balance" 44:08 "Brain Signals and Survival" 48:53 Measuring Cognitive Fatigue in Training 56:37 "Concussion Effects and Recovery" 01:00:18 "How Brains Heal Differently"

    1h 3m

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out of 5
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About

Dial in those workouts with deep insights and cutting-edge science from the most prominent voices in the endurance and hybrid sports world. Whether you're a triathlete, cyclist, runner, ultra-endurance athlete or coach, and many other sport types, subscribe now to learn how to train for success. Endurance Unlimited is your endurance training resource. To learn more about how TrainingPeaks can help you achieve your training goals, visit us at trainingpeaks.com.

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