Is there an upper limit for caffeine in ultra-endurance? Scott Tindal saw that Josh Amberger rode 356 miles at Unbound XL on roughly 1,600mg of caffeine, about four times the FDA's daily ceiling, and assumed it was a typo. It wasn't. In this episode of Fuelin Sessions, Scott is joined by Fuelin dietitian Megan Foley, and they dig into it. They discuss why there's no guideline to check that number against, what matters more than a fixed mg/kg dose, and why the only real ceiling is the one you find in training.Josh Amberger and Precision Fuel & Hydration GraphicInfographicFuelin on Instagram⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠ ⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠Check Out The Fuelin App⁠⁠

In this episode of Fuelin Sessions, Scott Tindal is joined by Chad Brothers, a Fuelin athlete, real estate professional, father of two, and a middle-of-the-pack triathlete with a story most athletes never tell. They discuss the addiction that emptied his corner, how he went from 275lb and unable to run to his mailbox to a 12:06:41 at Challenge Roth, why the second Ironman nearly broke his motivation, the fuelling that took him past 150g of carbs an hour, and the moment he decided to race for someone other than himself.Fuelin on Instagram⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠ ⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠Check Out The Fuelin App⁠⁠

In this episode of Fuelin Sessions, Scott Tindal is joined by Dr. Alan McCubbin, accredited sports dietitian and Monash University researcher, to pressure-test carb loading against the new "Beyond Belief" review paper. They dig into why a 50-year-old practice rests on just two flawed double-blind trials; why old physiology studies were never designed to answer today's performance questions; and why blinding carbs is so hard. The takeaway isn't a debunk: lack of evidence isn't evidence of no effect. Carb loading stays. It's low-cost, low-risk, and worth it.StudyBeyond Belief? Absence of Double-Blinding and Limited Ecological Validity in Carbohydrate Loading Research Fuelin on Instagram⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠ ⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠Check Out The Fuelin App⁠⁠

In this episode of Fuelin Sessions, Scott is joined by applied sport scientist Jonah Rosner (ex-NFL, Nike Running Performance Lab NYC). They discuss why mechanical tension — not heavy weight — drives muscle growth, how blood flow restriction builds similar muscle at 20–30% of your max, who benefits most from injured athletes to hospital patients, and the practical protocol: limb occlusion pressure, the 30-15-15-15 scheme, and BFR's role in recovery and pain relief.NewsletterInstagramFree Foot and Calf Strength PlanBFR papersLoenneke et al. 2025, Twenty-five years of blood flow restriction training: What we know, what we do not know, and where to next? Kataoka et al. 2025, Submaximal low-load resistance exercise with blood flow restriction produces similar results to low-load exercise to failure for muscle size and strength, but not endurance. Peden et al. 2026, Sprint-interval training with post-exercise blood flow restriction increases mitochondrial content and respiration. Lavigne et al. 2025, Physiological mechanisms underlying enhanced performance after blood flow-restricted exercise training in elite endurance athletes. ⁠⁠⁠⁠⁠Fuelin on Instagram⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠ ⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠Check Out The Fuelin App⁠⁠

In this episode of Fuelin Sessions, Scott is joined by professional runner and Puma athlete Lucy Reid. They discuss her recovery from a medial meniscus root repair and eight weeks non-weight-bearing, why the biggest nutrition mistake injured athletes make is easing off exactly when fueling matters most, why recovery often means eating more rather than less, a supplement protocol driven by blood testing and retesting instead of guesswork, the rehab tech behind her comeback (blood flow restriction, muscle stim, and the AlterG treadmill), the DEXA scan showing under 3% muscle asymmetry, and her return to racing at the British 10K Championships after 16 months out.Lucy Instagram⁠⁠⁠⁠⁠Fuelin on Instagram⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠ ⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠Check Out The Fuelin App⁠⁠

In this episode of Fuelin Sessions, Scott is joined by Fuelin dietitian and triathlete Megan Foley. They discuss a new study of female athletes at the 2024 Nice Ironman World Championships that found most fell short of their carb-loading targets, why the gap on race day is rarely about knowledge and almost always about execution, how "eating clean" and too much fiber can sabotage a race, the finding that athletes who fueled more finished faster, the mindset shift from training to eat to eating to train, and the lack of female representation in sports-nutrition research.Study⁠⁠⁠⁠⁠Fuelin on Instagram⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠ ⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠Check Out The Fuelin App⁠⁠

In this episode of Fuelin Sessions, Scott is joined by running coach and writer Mario Fraioli. They discuss his recovery from disordered eating and the "lighter is faster" myth that still lingers in endurance sport, the influence a coach's words can have on an athlete for decades, the super-shoe and fueling revolution behind today's tumbling marathon times, why no endurance champion trains low-carb, and a candid take on doping and the case for more transparent testing.Content note: this episode discusses disordered eating. In the US, the National Alliance for Eating Disorders runs a free, clinician-staffed helpline (allianceforeatingdisorders.com).The Morning Shakeout⁠⁠Mariofraioli.com ⁠⁠⁠⁠⁠⁠Fuelin on Instagram⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠ ⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠Check Out The Fuelin App⁠⁠

In this episode of Fuelin Sessions, Scott is joined by Chief Fueling Officer Daniela Ryf. They discuss her transition from professional athlete to lifestyle, her hesitancy to jump on the latest supplement trends, the importance of consistency, and a newfound realization of how enjoyment and social connection can make a big difference in fitness. ⁠⁠⁠⁠Fuelin on Instagram⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠ ⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠Check Out The Fuelin App⁠⁠

In this episode of the podcast, Scott is joined by renowned running coach Mario Fraioli, where they discuss the importance of enjoyment in racing, personalized coaching, and the evolving role of technology and AI in training and nutrition. Discover practical tips for athletes and coaches to optimize performance while maintaining joy and sustainability.The Morning ShakeoutMariofraioli.com ⁠⁠⁠⁠Fuelin on Instagram⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠ ⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠Check Out The Fuelin App⁠⁠

Are shortcuts killing what makes sport worth doing? Scott Tindal and co-host Jan dig into the Enhanced Games and performance-enhancing drugs — and why taking the easy route strips away the consistency, the work, and the discomfort that give endurance sport its meaning.They also take on the optimization trap — why athletes become "prisoners to the numbers" with wearables like Whoop and Oura — before getting practical on real-food fueling, protein and meal timing, and the carb-loading science most athletes get wrong.Referenced Study: Carbohydrate ingestion eliminates hypoglycemia and improves endurance exercise performance in triathletes adapted to very low- and high-carbohydrate isocaloric diets⁠⁠⁠⁠Fuelin on Instagram⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠ ⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠Check Out The Fuelin App⁠⁠