Huberman LabHow to Exercise for Strength Gains & Hormone Optimization | Dr. Duncan French
CHAPTERS
- 0:00 – 8:40
Intro to Dr. Duncan French and Hormone-Focused Training
Huberman introduces Dr. Duncan French, outlining his background in exercise physiology, elite sport, and his role at the UFC Performance Institute. They set the stage for a conversation centered on how training order, load, and duration affect hormones like testosterone, estrogen, cortisol, and catecholamines, and how French translates mechanistic science into practical protocols.
- •French has over 20 years in elite sport, including work with Olympic and professional athletes and now MMA.
- •His PhD and research focused on exercise physiology, resistance training, and neuroendocrinology.
- •He studies how exercise sequence (endurance vs resistance) and training design alter hormones and neurotransmitters.
- •The goal of the episode is to provide directly applicable training protocols for both athletes and general exercisers.
- 8:40 – 25:40
French’s Career Path and Perspective on Performance Science
French describes his origins in northern England, his early career as a PE teacher, and his determination to enter elite sport and research. He recounts cold-contacting major researchers, eventually securing a PhD position in the U.S., and highlights the value of wearing multiple hats: scientist, coach, educator, and high-performance leader.
- •Grew up in Yorkshire, studied sport science, and trained as a PE teacher.
- •Was a good but not professional-level athlete, which fueled his interest in elite sport support.
- •Persistently contacted top U.S. researchers (e.g., William Kraemer) and secured PhD funding at Ball State, later transferring to UConn.
- •Values academic rigor combined with authenticity and the ability to speak to athletes, coaches, executives, and academics.
- 25:40 – 35:00
How Resistance Training Drives Testosterone and Growth
They dive into how heavy compound resistance training acutely elevates testosterone in both men and women, via adrenal and gonadal pathways. French explains that testosterone acts on many tissues beyond muscle and outlines the specific set-rep-rest schemes his research used to maximize anabolic hormone responses.
- •In women, resistance training-driven testosterone increases come from the adrenal glands; in men, both adrenals and testes contribute.
- •Testosterone receptors exist in muscle, tendon, ligament, bone, and neural tissue, making it a broad adaptation driver.
- •French’s protocols: 6×10 at ~80% 1RM with 2-minute rests on compound lifts to maximize mechanical and metabolic stress.
- •Growth hormone and testosterone have somewhat different drivers; GH is more intensity-driven, testosterone depends on both intensity and volume.
- •Too much volume (e.g., 10×10 at 80%) forces load reductions and reduces the hormonal and hypertrophic stimulus.
- 35:00 – 47:00
Programming Hypertrophy: Volume, Rest, and Frequency
French and Huberman unpack the practical implications of his lab protocols, emphasizing that shorter rest intervals and appropriately high volume are crucial for muscle growth. They discuss training frequency, the need to suffer metabolically in hypertrophy sessions, and how different training ages change what frequency is sustainable.
- •Shorter rest (around 2 minutes) at high load increases metabolic stress (lactate), amplifying hypertrophy and hormonal response.
- •Training slowly with very long rests preserves performance per set but blunts the metabolic stimulus and growth.
- •A protocol as hard as 6×10 at 80% 1RM is best used about twice per week for non-bodybuilders.
- •Other weekly sessions can emphasize different qualities: lighter high-rep work, and low-volume, high-intensity strength work.
- •Bodybuilders may tolerate and need more such sessions, but most athletes must manage multiple performance qualities.
- 47:00 – 1:03:00
Stress, Catecholamines, and Performance Enhancement
They explore French’s PhD work on sympathetic arousal, epinephrine, and testosterone in the context of intense workouts, using parachute jump research as a conceptual model. French shows that anticipating a hard session triggers a physiological stress response that, when properly harnessed, improves performance and hormone output.
- •Before a daunting workout, epinephrine and norepinephrine rise in anticipation, preparing the body for effort.
- •Individuals with larger catecholamine responses maintain higher force output across the session.
- •Short-term stressors can acutely raise testosterone; chronic, unmanaged stress remains harmful.
- •Preparation rituals—music, pre-workout routines, psychological priming—can beneficially elevate arousal before training or competition.
- •Repeated exposure to the same stress reduces its psychological and physiological impact, requiring progressive overload of challenges.
- 1:03:00 – 1:18:00
Cold Exposure: Stress, Recovery, and When It Backfires
The conversation shifts to cold exposure and its dual roles as a mental stressor and a physiological recovery tool. French explains that the body does not distinguish between different stress types at the level of the sympathetic response and highlights emerging evidence that post-training cold can blunt hypertrophy and strength adaptations.
- •Cold exposure triggers the same kind of sympathetic stress response as heat, exercise, or pain.
- •Physiologically, cold constricts blood vessels systemically, complicating the idea of targeted “flushing” or recovery of specific muscles.
- •Research indicates that frequent cold exposure after resistance training reduces strength, power, and hypertrophy gains via mTOR and inflammatory blunting.
- •Cold is best placed in competition phases to aid recovery and technical quality, not during heavy tissue-building cycles.
- •Effective high-performance planning requires periodizing cold use, much like training loads and nutrition.
- 1:18:00 – 1:33:00
Skill Acquisition, Neural Fatigue, and Quality over Quantity
Huberman and French discuss how skill training differs from pure conditioning: it is not about accumulating volume but rehearsing high-quality, accurate movements. Fatigue rapidly degrades technique, and the best athletes and coaches stop sessions when technique falters, favoring many short, intense, mentally focused practices over marathon sessions.
- •True motor learning depends on precise, accurate repetitions; fatigue-induced sloppiness undermines skill acquisition.
- •Shorter, high-quality sessions (e.g., 60–90 minutes) are preferable to 3-hour grinds for technical development.
- •The best athletes leave sessions mentally as well as physically fatigued because of intense cognitive engagement.
- •Cognitive and neural load require fueling too; low-intensity “technical” sessions can still demand substantial carbohydrate for the brain.
- •Athletes often underfuel after skill sessions, incorrectly assuming they were low demand because intensity was not maximal.
- 1:33:00 – 1:47:00
Metabolic Efficiency and Periodized Nutrition
French outlines how the UFC Performance Institute structures athletes’ diets based on training demands and the concept of metabolic efficiency. Rather than endorsing a single diet, they train athletes to use fats at low intensities and carbohydrates at high intensities, often combining low-carb baselines with precisely timed carb intake around hard sessions.
- •Pure ketogenic diets are generally not advised for high-intensity sports like MMA, which require carbohydrate for peak efforts.
- •The PI often uses a keto-like pattern for baseline meals (breakfast, lunch, dinner) with targeted carbs immediately pre/during/post intense training.
- •Metabolic efficiency means preferentially using fats at low intensities and carbs at higher intensities, delaying glycogen depletion.
- •Modern high-carb diets push people to use carbs even at low intensities, leaving them fatigued when intensity spikes.
- •General population can practice “needs-based eating”: reduce carbs during low-activity or steady-state phases and increase them during high-intensity training or competition blocks.
- 1:47:00 – 2:01:00
French’s Olympic Background and the Complexity of MMA
French recounts his 14 years in the British Olympic system across multiple sports before moving to Notre Dame and then to the UFC. He contrasts traditional sports with MMA, emphasizing the enormous variability in styles, weight classes, schedules, and demands that make mixed martial arts uniquely challenging to support scientifically.
- •Worked across boxing, rowing, gymnastics, basketball, soccer, and taekwondo in the British Olympic system.
- •At Notre Dame he oversaw integrated performance services (medical, S&C, nutrition, psych, sport science).
- •MMA combines striking, wrestling, grappling, and transitions—French calls it the “decathlon of combat.”
- •There are 11 weight classes, diverse fighting styles, and complex weight-cut and rebound dynamics.
- •Unlike fixed-season sports, UFC fighters may get fights on short notice, forcing rapid changes in training periodization.
- 2:01:00 – 2:14:00
Psychological Resilience and State Switching in Fighters
They examine the mental side of MMA, noting the paradox that fighters are often polite and calm off the mats yet capable of intense aggression in the cage. French underscores the importance of being able to toggle between high-arousal fight mode and low-arousal recovery mode and links this flexibility to sustainable high performance.
- •MMA athletes are remarkable for their willingness to “embrace the grind” and endure daily physical and mental challenges.
- •Despite the violence of their sport, many fighters are soft-spoken and courteous outside training.
- •The ability to turn intensity on for training and fights and off for recovery mitigates chronic stress and burnout.
- •Performance staff use sleep, nutrition, training structure, and psychology support to help fighters manage this state switching.
- •Chronic stress issues in MMA more often relate to repeated weight cutting and metabolic strain than to constant psychological hyperarousal.
- 2:14:00 – 2:26:00
Heat Acclimation, Saunas, and Adaptation-Led Programming
French explains how the PI uses sauna-based heat acclimation to improve sweating efficiency and assist with safer, shorter weight cuts. He emphasizes that heat is another stressor requiring progressive overload and timing, and broadens the concept of “adaptation-led programming” to encompass training, recovery, nutrition, and environment.
- •Heat exposure (e.g., ~200°F sauna) is a physiological stressor akin to exercise or cold.
- •PI protocols start with ~15 minutes, sometimes broken into 3×5 minutes, and progress toward 30–45 continuous minutes.
- •Roughly 14 sauna exposures, implemented 8–10 weeks before a fight, are needed to meaningfully improve sweat rate and thermoregulation.
- •Better heat adaptation means fighters can lose water weight more efficiently, spending less overall time in extreme conditions.
- •French advocates “adaptation-led programming”: deliberately choosing stressors and timing (lifting, cold, heat, nutrition) to target specific adaptations.
- 2:26:00 – 2:38:00
Experimentation, Time Frames, and Individual Response
They discuss practical time frames for experimentation for non-elite individuals and the importance of logging subjective and objective responses. French notes that while the PI may use 3-week overreach blocks with pros, recreational trainees can use 12-week blocks to fairly test new protocols, provided they track mood, sleep, and performance.
- •For most people, 12 weeks is enough to see clear positive or negative effects from a new training, diet, or recovery strategy.
- •The PI sometimes uses much shorter (e.g., 3-week) aggressive overload blocks with fighters, depending on scheduling.
- •Individual responses to identical training sessions vary widely across athletes due to physiological and psychological differences.
- •French encourages athletes to keep journals tracking training, sleep, mood, and perceived recovery to interpret adaptations.
- •Being a “thinking athlete” or “scientist of yourself” is crucial—elite or recreational.
- 2:38:00
UFC PI’s Broader Mission and Future Directions
In closing, French describes the UFC Performance Institute’s mission to push the boundaries of human performance science and to share insights beyond MMA. He mentions work with emerging technologies, nutrition, brain health, and collaborations (including with Huberman’s lab) aimed at generating evidence that can benefit athletes and the general public.
- •The PI aims to provide integrated, cutting-edge care for UFC athletes while also influencing global performance science.
- •They partner with technology, nutrition, psychology, and data companies to test and refine tools and methods.
- •Research areas include CBD, psychedelics, thermal monitoring, physiological telemetry, and advanced data analytics.
- •Insights from fighters can be translated to everyday health, resilience, and performance.
- •Huberman and French hint at upcoming joint research projects that will later be shared publicly.
