The Athlete's Compass

In part two of the conversation with Dr. Julia Casadio, the team explores why so many adolescent girls leave sport during their teenage years and how coaches, parents, and support teams can better respond. Julia explains how female puberty affects performance, injury risk, confidence, menstrual health, fueling, and enjoyment, while emphasizing that many girls simply need better education, patience...

In this episode of The Athletes Compass Podcast , Dr. Julia Casadio explains how athletes can use heat training as a powerful performance tool, especially when preparing for hot and humid races. Drawing on her experience with Olympic athletes and her research in applied sport physiology, she explains why women often need longer heat adaptation windows than men, how “thermal memory” allows athletes...

In this episode of The Athletes Compass Podcast , Dr. Kristen Holmes, Global Head of Human Performance at Whoop, explains why sleep-wake consistency may be one of the most powerful yet overlooked drivers of performance, recovery, and long-term health. Drawing from years of athlete and wearable data, she shares how regular sleep timing is linked to better physiology, improved resilience, and strong...

In this episode of The Athletes Compass , Paul Warloski, Dr. Paul Laursen, and Marjaana Rakai explain Athletica’s Workout Reserve and the new Systems Engagement feature. Workout Reserve is described as a battery-like metric that shows how close an athlete is to their historical best across different durations, from short sprint efforts to long aerobic performances. The team discusses how athletes...

In this episode of The Athletes Compass Podcast , Dr. Iris Nafshi joins the team to discuss her research on “Iron Moms,” endurance athletes who train for Ironman while navigating motherhood, work, family expectations, and guilt. Drawing from her PhD dissertation, Beyond Grit and Guilt , Iris explains that athletic identity does not compete with maternal identity; it can expand it. The conversation...

In this episode of The Athletes Compass , Dr. William B. Irvine joins Paul Warloski, Paul Laursen, and Marjaana Rakai to explore how Stoic philosophy can help endurance athletes train, race, and live with more resilience. Irvine connects rowing, coaching, discomfort, failure, and competition to practical Stoic ideas such as focusing on what you can control, reframing setbacks, practicing negative...

In this episode of The Athletes Compass Podcast , Paul Warloski, Dr. Paul Laursen, and Marjaana Rakai break down the concept of power and pace profiles — the personalized performance fingerprints hidden inside your training data. They explain how these profiles reveal an athlete’s strengths, weaknesses, critical power, and sustainable race pace without expensive lab testing. The conversation explo...

In this episode of The Athletes Compass , Paul Warloski, Dr. Paul Laursen, and Marjaana Rakai discuss how everyday endurance athletes can make meaningful progress with limited training time, especially when balancing work, family, and life. The conversation centers on the “minimum effective dose” of training, why context and goals matter, how to use intensity wisely, and why consistency is often m...

In this episode of The Athletes Compass , Paul Warloski, Dr. Paul Laursen, and Marjaana Rakai explore recovery strategies for everyday endurance athletes, emphasizing that sleep and nutrition remain the foundation while tools like cold water immersion, sauna, compression garments, massage guns, foam rolling, forest bathing, and active recovery can all have a place depending on context. The convers...

In this episode of The Athletes Compass , Paul Warloski and Dr. Paul Laursen unpack the current high-carb fueling trend in elite endurance sport, sparked by reports of top marathoners consuming 100–120 grams of carbohydrate per hour. The conversation challenges the traditional idea that carb intake primarily boosts performance by sparing muscle glycogen, instead highlighting emerging research sugg...

In this episode of The Athletes Compass , Dr. Allie Wagener, a licensed psychologist specializing in sport and performance psychology, joins Paul Warloski, Marjaana Rakai, and Dr. Paul Laursen to unpack athlete burnout: what it is, how it differs from fatigue or a training slump, and how endurance athletes can recognize the warning signs before they become overwhelming. The conversation explores m...

In this episode of the Athletes Compass podcast, Dr. Peter Reaburn shares practical and science-backed guidance for endurance athletes who want to stay healthy, strong, and competitive well into older age. Drawing from both decades of research and his own experience as a masters athlete, Reaburn explains why strength training becomes increasingly important with age, how muscle mass and power under...

In this episode of the Athletes Compass podcast, the team breaks down aerobic efficiency—what it is, why it matters, and how it may be more important than VO2 max for long-term endurance performance. They explore the physiology behind efficiency, including mitochondrial development and capillary density, and explain practical ways to measure it using metrics like efficiency factor and aerobic deco...

In this episode of The Athletes Compass , Dr. Rebecca Robinson breaks down one of the most overlooked areas in endurance sports: women’s health across the lifespan, with a focus on perimenopause and menopause. Drawing from her experience as both a sports medicine physician and competitive marathoner, she explains how hormonal changes impact performance, recovery, and overall health—and why decline...

In this episode, Erin Carson, one of the most respected strength coaches in endurance sports, breaks down why movement quality is the foundation of performance, injury prevention, and long-term athletic success. She explains how many athletes are already “strong enough” but are limited by stiffness, poor mechanics, and inefficient movement patterns. From simple at-home routines to the concept of “...

This episode explores one of the most debated topics in endurance training: whether athletes should take full rest days or train every day. Drawing from elite athlete examples and recent research, the hosts explain that there’s no single “correct” approach. Instead, recovery depends on training intensity, individual preferences, and lifestyle. They highlight the importance of low-intensity (zone 1...

Heart rate variability (HRV) is transforming how endurance athletes approach training by providing real-time insight into recovery and readiness. Instead of following rigid training plans, HRV allows athletes to adapt workouts based on their nervous system state, leading to better performance gains and reduced risk of overtraining. This episode breaks down what HRV actually measures, how it reflec...

In this episode of the Athletes Compass Podcast , the hosts explore the pros and cons of training alone versus training in a group. Recent research suggests that while both approaches can produce similar fitness outcomes, group training may lead to greater improvements in functional performance due to social support and motivation. The discussion highlights psychological drivers like self-efficacy...

In this episode of the Athletes Compass Podcast , the hosts explore Athletica’s new AI Coach , a tool designed to provide personalized training feedback and answer athlete questions based on the science of high-intensity interval training. Built using a retrieval-augmented AI system trained on the HIIT Science textbook and Athletica’s internal knowledge base, the coach analyzes workout data, recov...

Episode Summary In this episode of The Athletes Compass , the team sits down with Siren Seiler-Viken—researcher, coach, and emerging voice in Hyrox performance science. From her early years as an elite dancer to national-level distance running and now competitive Hyrox racing, Siren shares how sustainability, intelligent planning, and aerobic development form the foundation of hybrid performance....

In this powerful and deeply relatable episode, Jeff Weiss shares how he went from starting his first 10K at age 48 to completing Ironmans, ultra marathons, and chasing the World Marathon Majors in his 60s. Along the way, he unpacks the mental battles behind endurance sport, the value of failure, and why chasing big goals reshapes how we see ourselves. From narrowly missing the cutoff at the legend...

In this episode of The Athletes Compass , Dr. Paul Laursen and the team break down the science and practical application of the second threshold — also known as LT2, VT2, FTP, or critical power. They explain what physiologically happens when you cross this boundary, why base training is essential before adding threshold work, and how over-unders, tempo sessions, and VO2 max intervals raise perform...

In this episode, Dr. Mikki Williden returns to The Athletes Compass to explore the Constrained Energy Model , a concept reshaping how athletes and coaches think about training and fueling. Drawing on the groundbreaking work of Dr. Herman Pontzer, Mikki discusses the biological limits of daily energy expenditure, and why the old model of "more exercise = more calories burned" often backfires, leadi...

In this episode of Athlete’s Compass, hosts Paul Warloski, Dr. Paul Laursen, and Marjaana Rakai explore the overlooked yet critical elements of pre-race preparation: warmups and openers. Drawing on science and experience, they break down concepts like post-activation potentiation (PAP), the Q10 temperature effect, VO2 kinetics, and how proper timing, intensity, and individual context can make or b...

In this episode, triathlete Jerome Guionnet shares his inspiring transformation from a non-competitive French parent to a world-class age-group triathlete competing in multiple Ironman World Championships. Sparked by his daughter’s interest in triathlon, Jerome began his journey in his 50s and now regularly finishes in the top 10% of his age group. He discusses the difference between exercising an...