Essentials: How to Exercise for Strength Gains & Hormone Optimization | Dr. Duncan French
Dr. Duncan French, PhD, Vice President of Performance at the UFC Performance Institute, shares insights into the science of strength training. He discusses the impact of resistance training on testosterone levels and outlines effective protocols like the '6 x 10' method. Duncan emphasizes the balance of cold exposure for recovery and performance, and the role of nutrition in training. He also delves into metabolic flexibility, explaining how the body optimizes fuel usage depending on intensity.
Top snips
How Resistance Training Raises Testosterone
0:29 – 2:46
Heavy resistance triggers a stress response (mechanical + metabolic) that signals androgen release via catecholamines and HPA-axis activity.
Both men and women increase anabolic hormones after lifting — women via the adrenals. Testosterone helps muscle, tendon, ligament, even neural tissue.
It's a stress response, right?
— Duncan French
The 6×10 Protocol — a Hormone Driver
4:53 – 6:16
To spike testosterone, try 6 sets of 10 reps @ ~80% 1RM, often using multi-joint lifts (e.g., back squat).
Keep loads adjusted so all 10 reps are completed. This combines mechanical intensity and metabolic volume to create an anabolic environment for hypertrophy and strength gains.
Rest, Metabolic Stress, and Growth
5:26 – 8:26
Shorter rests (2 min) increase metabolic stress and lactate, boosting hypertrophic signals compared with longer rests (3+ min).
If your goal is muscle growth, prioritize intensity + volume with limited rest. For maximal strength, extend rest to preserve force output.
Quality of programming matters more than just time spent.
How Often to Do ‘Suffer’ Workouts?
11:08 – 12:02
Intense, high-metabolic sessions (like 6×10 @80%) are best ~2×/week for most people.
Use other sessions to vary intensity/volume (12–20 reps, skill work) and protect recovery. Track mood, sleep, performance — adapt frequency by training age and tolerance.
Cold Exposure: When it Helps vs. Hinders
15:11 – 18:39
Cold is a stressor — it raises epinephrine but can blunt hypertrophy if used during muscle-building phases (dampens mTOR).
Use cold during competition/taper to speed recovery and preserve performance. Avoid routine ice baths when your goal is maximal muscle growth.
Heat Acclimation & Sauna Protocol
34:44 – 35:44
Heat adaptation improves sweating and thermoregulation. Start with ~15 min sauna sessions (work up via 3–5 min exposures) and progress toward 30–40+ min.
Duncan notes ~14 sauna exposures across weeks produce meaningful adaptation — begin 8–10 weeks before event for best effect.