Building muscle

What works

Proximity to failure, not the load on the bar, is the gatekeeper of muscle growth. Multiple gold-tier voices converge here. Dr. Bill Campbell states that heavy, moderate, or light weights build similar muscle as long as each set is taken to near failure, and cites a 9-week trial in untrained women where 5-7 rep and 10-14 rep groups gained equally when all sets hit failure (Dr. Bill Campbell). Dr. Mike Israetel frames tension per muscle fiber as the number one growth factor, achieved by sets of 5 to 30 reps close to failure. Dr. Lauren Colenso-Semple and Dr. Sohee Carpenter echo that low and high loads work equally when pushed within a few reps of failure, and Kelly and Juliet Starrett insist meaningful adaptation needs effort near failure with one or two reps in reserve rather than casual exercise.

A wide rep range of roughly 5 to 30 reps per set builds muscle equally well. Dr. Pat Davidson cites 5 to 30 reps as producing the same outcomes and encourages choosing ranges you enjoy for adherence. Dr. Mike Israetel gives the same 5 to 30 window, and Dr. Bill Campbell adds the important boundary: very light weights allowing more than 30 reps per set produce less growth. Campbell also offers a practical blend: roughly 60% of sets with moderate weights (6-12 reps), 20% heavy (3-5 reps), 20% light (15-20 reps) (Dr. Bill Campbell).

Around 10 to 20 hard sets per muscle group per week is the productive zone, with clear diminishing returns beyond it. Dr. Sohee Carpenter recommends at least 10 sets per muscle per week, Dr. Alyssa Olenick places the plateau-breaking zone at 10 to 20 sets with diminishing returns beyond 20, and Judd Lienhard lands on about 20 effective sets near failure as optimal with 10 sets as the minimal effective dose. Louisa Nicola cites 12 to 20 sets per muscle per week at 30% to 85% of 1RM. Below that, growth still happens slowly: Dr. Mike Israetel notes 1 to 3 hard sets per muscle per week still yields slow gains, and Dr. Pat Davidson says moderately trained people grow on 4 to 6 sets per muscle per week, with maintenance possible on 3 to 6 sets.

Progressive overload is non-negotiable, and volume should start low and ramp based on recovery. Dr. Mike Israetel advises starting volume low and progressively increasing it as recovery allows. Michelle MacDonald defines overload as steadily increasing load, volume, density, range of motion, or skill efficiency, and Dr. Lauren Colenso-Semple recommends keeping the same exercises for several weeks while adding reps, weight, or better form. Judd Lienhard formalises this as double progression: fill an 8-12 rep range, then add weight. Dr. Alyssa Olenick stresses small, repeatable increases rather than forcing progress weekly.

A controlled eccentric of about 2 to 5 seconds amplifies the growth stimulus. Jeff Cavaliere prescribes roughly 4-second reps (1 second up, 3 seconds down) and eccentric-overload phases of 3 to 5 seconds (Jeff Cavaliere). Dr. Alyssa Olenick recommends a 2-3 second eccentric with a natural-speed concentric, Mike Boyle uses slow eccentrics to enforce honest effort, and Dr. Sohee Carpenter notes eccentric contractions matter more than concentric for hypertrophy.

Full range of motion with emphasis on the stretched, bottom position is the default. Dr. Pat Davidson calls full range of motion essential, Dr. Mike Israetel identifies the bottom end of a lift as where most growth stimulus occurs and endorses bottom-end partials after full-range sets, and Jeff Cavaliere favours exercises that place muscles under a deep stretch, such as lying triceps extensions.

Minimal-dose training works for busy people. Dr. Bill Campbell reports that one hard set to or near failure per workout delivers about 90% of the anabolic benefit, and one hard set twice per week is an effective minimal approach, optionally extended with a drop set that folds three sets into one (Dr. Bill Campbell). Dr. Lauren Colenso-Semple confirms 20 to 30 minute sessions still move the needle, and Louisa Nicola puts the maintenance floor at 3 to 6 sets per muscle per week.

Rest between sets should be autoregulated, typically 1 to 3 minutes. Dr. Mike Israetel gives four readiness checks (breathing, whole-body strength, non-target muscles, target muscle able to give at least 5 good reps), with rests from 5 seconds to 5 minutes and 1 to 3 minutes typical. Judd Lienhard allows under 2 minutes for novices while advanced lifters need 3 to 6 minutes on top sets.

For specific situations

• Women build muscle just as well, relative to starting mass, and will not accidentally bulk up. Dr. Bill Campbell shows relative gains are equal between sexes despite roughly 90% less testosterone in women; Dr. Vonda Wright reassures that bulk requires deliberate long-term training. Michelle MacDonald observes many women underestimate their effort level and need to train hard.
• Perimenopause and beyond: hypertrophy lifting with progressive overload is essential, and circuit or HIIT classes alone are not enough (Michelle MacDonald). Dr. Bill Campbell pairs maximised protein and resistance training to prevent menopausal muscle loss. Typical effective interventions for midlife women use 2-3 sets of 8-15 reps per exercise (Dr. Alyssa Olenick); for women around 50, Michelle MacDonald suggests 6-10 hard sets per muscle per week (ceiling 10-12), kept 0-3 reps shy of failure.
• Older and advanced lifters: keep intensity high, trim volume. Judd Lienhard puts the minimal effective dose for people in their 40s and beyond at about 5 sets per movement pattern per week, with more than 10 becoming excessive; Dr. Vonda Wright insists intensity must not drop with age to keep muscle protein synthesis active.
• Beginners misjudge effort: they may leave 4-5 reps in reserve while believing they are 1-2 away from failure (Jeff Cavaliere). Occasional sets taken to true technical failure calibrate the scale. Untrained people also grow from high-rep circuit training with bodyweight and light equipment when sets approach failure (Dr. Bill Campbell).
• Runners and hybrid athletes: fewer exercises, high effort, low volume. Dr. Alyssa Olenick recommends 4-6 exercises with 2-3 sets at 7-9 out of 10 effort, cutting accessory sets to 1-2 during high-mileage weeks rather than skipping sessions (Dr. Alyssa Olenick). Dr. Michelle Boland keeps runners at 3-8 reps to manage fatigue.
• Athletes: bodybuilding-style tissue work should dominate the training year, then recede during peaking phases in favour of explosive work (Dr. Pat Davidson; Dr. Pat Davidson).
• When dieting or on GLP-1 medications, keep lifting. Resistance training defends lean mass during deficits (Dr. Bill Campbell); during cuts, keep intensity heavy but drop volume to 2-3 sets per movement pattern (Judd Lienhard).

Open questions

• Failure versus reps in reserve. Dr. Bill Campbell and Dr. Sohee Carpenter hold that stopping 2-3 reps shy of failure matches failure training for growth in multi-set programs, with less fatigue and mental strain. Jeff Cavaliere counters that failure is the only objective measure of effort and becomes more necessary in higher rep ranges, and Dr. Jordan Shallow argues stopping before the true failure position is arbitrary. The pragmatic bridge, offered by Cavaliere himself: take early sets to failure to calibrate, then work at 1-2 reps in reserve (Jeff Cavaliere). Campbell adds that in single-set training, failure may be slightly better (Dr. Bill Campbell).
• The weekly volume ceiling. Dr. Sohee Carpenter and Dr. Alyssa Olenick support 10-20 sets per muscle; Judd Lienhard argues diminishing returns arrive at 10-12 sets per movement pattern, with 5-8 heavy sets optimal, and elsewhere concedes the true range is individual, roughly 5 to 40 (Judd Lienhard). Dr. Pat Davidson shows growth on as small as 4-6 sets. The safest reading: 10 is a solid baseline, individualise upward slowly.
• Best rep zone for older or newer lifters. Kelly and Juliet Starrett advocate 3-5 reps for adults because technique stays cleaner and fatigue is easier to read; Mike Boyle says 5-10 reps to failure is heavy enough and 1-5 reps is not worth the risk for adults; Dr. Vonda Wright prescribes 10-15 reps to failure for hypertrophy.
• Rest length and supersets. Michelle MacDonald says long rests are unnecessary for hypertrophy and supersets add volume efficiently, with Dr. Mike Israetel endorsing minimal-rest supersets for beginners; Judd Lienhard wants 3-6 minutes for advanced lifters chasing top-set performance. These reconcile by goal: density for time-pressed hypertrophy, longer rests when set quality is paramount.

Cautions

• Soreness is not the target. It signals volume and novelty, not growth; excessive soreness that outlasts the next session means too much volume, while zero soreness plus zero progress means too small (Dr. Mike Israetel; Dr. Alyssa Olenick).
• The pump is a favourable sign, not a growth mechanism (Dr. Pat Davidson).
• Avoid extreme single-session volume such as 100-rep drop sets or 10 sets to failure on one exercise; high-volume, low-intensity work like 100 easy push-ups daily builds small and erodes joints (Jeff Cavaliere).
• Sets beyond about 30 reps underdeliver for hypertrophy (Dr. Bill Campbell).
• Pilates, barre, and yoga with light weights are insufficient for optimal growth without progressive resistance (Dr. Lauren Colenso-Semple).
• Program hopping when progress feels slow makes muscle building harder; growth is a months-to-years process (Dr. Pat Davidson).
• Training time of day does not change hypertrophy outcomes (Dr. Bill Campbell).

Putting it into practice

• Default working volume: 10 to 20 hard sets per muscle group per week; start new users at the low end (8-10) and ramp only while recovery and performance hold.
• Every working set lands at 0 to 3 reps in reserve; schedule occasional calibration sets to technical failure, especially for beginners on machine or isolation exercises.
• Allow any rep target from 5 to 30 per set; bias the mix roughly 60% at 6-12 reps, 20% at 3-5, 20% at 15-20, and never program sets beyond 30 reps for growth goals.
• Prescribe a 2-3 second eccentric with natural-speed concentric on hypertrophy work; reserve explosive intent for power blocks.
• Use full range of motion by default and prefer exercises loading the stretched position; bottom-end partials may extend a final set.
• Time-pressed mode: 1-2 hard sets to or near failure per muscle, twice weekly, optionally with one drop set; sessions of 20-30 minutes remain productive.
• Autoregulate rest at 1-3 minutes (novices may go shorter, advanced top sets up to 5); supersets of non-competing muscles are allowed when time efficiency is the goal.
• Cut weekly set counts roughly in half during calorie deficits or high cardio mileage while keeping load and effort high; over-60s and 40+ users cap at about 10 sets per movement pattern per week.

Experts in this guide: Dr. Alyssa Olenick, Dr. Bill Campbell, Dr. Jordan Shallow, Dr. Lauren Colenso-Semple, Dr. Michelle Boland, Dr. Mike Israetel, Dr. Pat Davidson, Dr. Sohee Carpenter, Dr. Vonda Wright, Jeff Cavaliere, Judd Lienhard, Kelly and Juliet Starrett, Louisa Nicola, Michelle MacDonald, Mike Boyle.

Before you act. Entrain is a free knowledge resource. It brings together what named doctors, scientists and coaches teach publicly, with sources, so you can explore and discuss it with your own clinician. It does not diagnose, treat or prescribe, and it is not a substitute for medical care.