How to Exercise for Strength Gains & Hormone Optimization

Summary

Dr. Duncan French, Vice President of Performance at the UFC Performance Institute and exercise physiologist with 20+ years of elite athletic experience, breaks down the science of resistance training for hormonal optimization. The conversation covers specific training protocols for maximizing testosterone production, the role of stress and catecholamines in performance, strategic use of cold and heat exposure, metabolic efficiency, and nutrition periodization for both athletes and general populations.

Key Takeaways

The optimal testosterone-boosting protocol is 6 sets of 10 reps at 80% of 1-rep max with 2-minute rest periods — driven by both mechanical and metabolic stress
Shorter rest periods (2 min vs. 3 min) produce greater muscle hypertrophy by sustaining the metabolic environment needed to drive lactate-related anabolic signaling
Pre-arousal and sympathetic activation (epinephrine/norepinephrine release before a challenging event) directly enhances force output and physical performance
Cold exposure can blunt muscle growth by dampening the mTOR and hypertrophic signaling pathways — timing of cold use relative to training phase is critical
Skill acquisition is quality-driven, not volume-driven — once movement quality degrades due to fatigue, learning stops and should be halted
Metabolic efficiency means training the body to use fat at low intensities and carbohydrates at high intensities — not defaulting to one fuel source exclusively
Carbohydrate timing around training sessions (pre, during, and immediately post) can support high-intensity work while maintaining a largely low-carb baseline diet
Testosterone increases in both men and women through resistance training, with women relying entirely on adrenal-released androgens
Two intense sessions per week of the testosterone-maximizing protocol is sufficient for most people; other sessions can vary in rep range and intensity

Detailed Notes

Testosterone and Resistance Training

Testosterone release from exercise is driven by both mechanical stress (load intensity) and metabolic stress (training volume/lactate)
Growth hormone, by contrast, is driven primarily by intensity alone
In men, testosterone is released from both the adrenal glands and the gonads during exercise; the field is divided on which contributes more acutely
In women, all exercise-induced testosterone comes from the adrenal glands — the downstream hormonal cascade is the same, just smaller in magnitude
Testosterone affects not only muscle but also tendons, ligaments, neural tissue, and bone (via androgen receptors distributed throughout the body)

The Optimal Resistance Training Protocol for Testosterone

Protocol studied:

Exercise: Back squat (multi-joint, multi-muscle compound movement)
Sets x Reps: 6 × 10
Intensity: 80% of 1-rep max
Rest: 2 minutes between sets
Key rule: If reps drop below 10, reduce the load to complete the full volume — maintaining the volume-intensity balance is essential

Why this works:

The combination of high intensity (mechanical strain) + sufficient volume (metabolic strain) drives lactate accumulation
Lactate signals further anabolic testosterone release
Moving to 10 × 10 (“German Volume Training”) at the same intensity is generally unsustainable and leads to significant load drop-off, reducing the mechanical stimulus

Training frequency:

2 times per week is recommended for this type of high-intensity, high-volume session
Other sessions in the week can focus on higher rep ranges (12–20) at lower intensity, or lower volume at higher intensity, to provide varied stimuli

Rest Periods and Metabolic Stimulus

Rest periods are as important a programming variable as load and volume
Extending rest periods (e.g., 3 min vs. 2 min) allows lactate to clear, reducing the metabolic stimulus
Shorter rest = greater metabolic stress = greater hypertrophy signal, even if absolute loads are slightly lower
Athlete A (6×10, 2-min rest) will likely see more muscle hypertrophy than Athlete B (6×10, 3-min rest)

Catecholamines, Arousal, and Performance

French’s PhD research focused on catecholamines (epinephrine/norepinephrine) and their role in exercise performance
Pre-workout arousal — the anticipatory stress response before a known challenging session — begins driving epinephrine/norepinephrine release 15 minutes before the workout starts
Athletes with higher sympathetic arousal sustained greater force output for longer throughout workouts
This is the physiological basis for pre-workout routines and music — they genuinely prime the sympathetic nervous system
The stress response to a challenging workout follows the same pathway as stress from public speaking, exam anxiety, or combat — the body does not distinguish the source

Cold Exposure: Strategic Use

Cold exposure triggers the same epinephrine stress response as heat, exercise, or threat
Cold clamps down the vascular system — evidence for targeted muscle blood flow redistribution is not robust
Cold blunts hypertrophy: Data shows cold exposure negatively impacts strength, power, and muscle growth by dampening the mTOR pathway and hypertrophic signaling
Strategic periodization of cold:
- During a muscle-building phase: Avoid cold exposure — it undermines the inflammatory response needed for adaptation
- During competition preparation or in-season: Cold can be used more freely as a recovery tool, since the goal shifts from building to performing
The inflammation and DOMS from training is the stimulus for adaptation — suppressing it prematurely undermines progress

Skill Acquisition and Mental Fatigue

Skill learning is quality-driven, not volume-driven
Once fatigue degrades movement accuracy, the motor learning signal is lost — this is when the session should end
Shorter, high-quality sessions (e.g., 90 min) are preferable to long sessions (3 hours) for skill development
Mental fatigue after hard physical training is likely connected to dopamine depletion and glucose availability in the brain
Cognitive training sessions (drilling, technique work) tax the brain similarly to physical sessions and require equivalent nutritional refueling

Nutrition and Metabolic Efficiency

Core principle — metabolic efficiency:

Train the body to use fat at low intensities and carbohydrates at high intensities
Most people on Western diets become over-reliant on carbohydrates even at low intensities, depleting glycogen before reaching high-intensity demands

UFC fighters’ nutritional strategy:

Largely ketogenic-style diet for baseline meals (breakfast, lunch, dinner)
Carbohydrates timed strategically: immediately pre-training, during, and immediately post-training
This approach maintains metabolic flexibility while fueling high-intensity efforts

Ketones:

Exogenous ketones are used at the UFC Performance Institute primarily post-fight to support brain energy supply after potential head trauma
They are not routinely recommended as a performance enhancer during training

General population guidance:

Match carbohydrate intake to training intensity — don’t gorge on carbohydrates during low-activity periods
Cycling periods of lower carbohydrate intake improves fat oxidation efficiency
The crossover point between fat and carbohydrate utilization is a key metabolic marker

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How to Exercise for Strength Gains & Hormone Optimization | Dr. Duncan French