Dr. Lauren Colenso-Semple on Huberman Lab: How close to fail

Close-to-failure sets produce hypertrophy equally in women and men; the interference effect only matters when high cardio volume is placed too close to lifting.

Dr. Lauren Colenso-SempleguestAndrew Hubermanhost

Feb 15, 20262h 31mWatch on YouTube ↗

WHAT IT’S REALLY ABOUT

Women’s training basics: progressive strength, smart cardio, ignore hype cycles

Dr. Lauren Colenso-Semple argues that skeletal muscle biology and training adaptations are largely similar in men and women; differences in baseline muscularity are mainly driven by puberty-related testosterone, not different “rules” for women’s training.
She outlines practical resistance-training setups (2–3x/week full-body or higher-frequency splits), emphasizing progressive overload, sufficient volume, and training close to failure rather than chasing gimmicks like hormone “boosting” workouts or extreme tempo tricks.
On cardio, she explains the interference effect is usually only relevant with very high endurance volumes placed too close to strength sessions; for general health, enjoyable activity plus strength training often suffices.
She tackles popular misconceptions—cycle syncing, cortisol fears, fasted training myths, and exaggerated hormone-therapy/creatine claims—while highlighting the importance of consistency, technique, and individualized decision-making based on how you feel.

IDEAS WORTH REMEMBERING

5 ideas

Women and men build muscle similarly once training starts.

Baseline muscle mass differs largely due to male puberty testosterone, but relative hypertrophy responses to training and protein intake are very similar across sexes.

Train close to failure; “easy sets” don’t drive much growth.

A workable heuristic is stopping ~1–2 reps shy of true failure; if you can do another 10 reps, the load is too light for hypertrophy.

For beginners, 2–3 full-body sessions/week is a high-return default.

Full-body training hits major muscle groups frequently enough without complex splits; if training 4+ days/week, upper/lower or push–pull–legs becomes practical.

Do 2–4 hard work sets per exercise/muscle focus—usually 3 is the sweet spot.

Colenso-Semple prefers ~3 work sets after warm-ups; beyond ~4 tends to be unnecessary for most people, especially when compound lifts already hit multiple muscles.

Rest is best individualized; ~2 minutes works for most, longer for heavy compounds.

Use auto-regulated rest: ~2 minutes is often enough for machines/dumbbells; ~3 minutes for squats/deadlifts; ~4–5 minutes if maximizing 1RM strength.

WORDS WORTH SAVING

5 quotes

The data says men and women respond to exercise very similarly.

— Dr. Lauren Colenso-Semple

No one is getting huge by accident.

— Dr. Lauren Colenso-Semple

If the goal is hypertrophy, we have way more flexibility… provided that we train close enough to failure.

— Dr. Lauren Colenso-Semple

Instead of worrying about whether you're in this phase or that phase… I would really focus on how you feel.

— Dr. Lauren Colenso-Semple

Walking with a weighted vest is not going to improve muscle or bone. It's not the appropriate stimulus.

— Dr. Lauren Colenso-Semple

Muscle differences by sex and testosterone mythsBeginner resistance-training structure: frequency, sets, proximity to failureRest intervals, supersets, time-efficient programmingRep ranges for hypertrophy vs strength; progression trackingCardio scheduling and the “interference effect”Menstrual cycle, contraception, perimenopause/menopause and trainingNutrition timing, protein, creatine, cortisol misinformationAging, nervous system, fall risk, machines/group fitness on-ramps

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