#335 ‒ The science of resistance training, building muscle, and anabolic steroid use in bodybuilding | Mike Israetel, Ph.D.
Dr. Mike Israetel, a sports physiologist and co-founder of Renaissance Periodization, discusses his journey in powerlifting and bodybuilding, the core principles of resistance training (exercise selection, volume, intensity, frequency), and debunks muscle growth myths. He also candidly shares his experience with anabolic steroids, their effects, and the potential of AI in human performance.
Deep Dive Analysis
16 Topic Outline
Mike Israetel's Background and Academic Journey
Transition from Powerlifting to Bodybuilding and Aesthetics
Value of Strength Training and Time Efficiency
Understanding Neurological and Physical Fatigue in Training
Optimizing Muscle Growth: Intensity, Volume, and Recovery
Designing an Efficient Resistance Training Program for Beginners
Guidance on Finding a Qualified Personal Trainer
Troubleshooting Training Plateaus: Exercise Selection and Breaks
Impact of Genetics, Age, and Lifestyle on Muscle Growth
Nutrition and Consistency for Muscle Gain
Personal Experience with Anabolic Steroids: Doses and Effects
Managing Estrogen and Health Risks with Steroid Use
Long-Term Health Trade-offs of Anabolic Steroid Use
Optimism for Future AI-Driven Medical Breakthroughs
Philosophical Implications of AI, Simulation, and Longevity
Ethical Debates Around GLP-1 Agonist Use in Bodybuilding
7 Key Concepts
Resistance Training
This is a general term for applying forces to muscles in the gym. Its primary goal is to make muscles stronger and larger (hypertrophy) by pushing them to high levels of force and fatigue, distinct from endurance training's sub-maximal efforts.
Compound Movements
These are exercises that involve multiple joints and muscle groups working simultaneously, such as squats, deadlifts, or pull-ups. They are highly time-efficient for training many muscles at once, making them ideal for general fitness and beginners.
Reps in Reserve (RIR)
RIR is a measure of training intensity, indicating how many more repetitions a person could perform before reaching complete muscular failure. Training with 1-2 RIR means stopping a set when you feel you could do one or two more reps, which is often optimal for growth with less fatigue than training to absolute failure.
Cumulative Fatigue
This refers to the gradual build-up of fatigue in the body over several weeks of consistent training, even with adequate recovery between individual sessions. To counteract this, planned breaks (deloads) are necessary to allow the body to fully recover and resensitize to training stimuli.
Anabolic Androgenic Steroids (AAS)
These are derivatives of the testosterone molecule, chemically altered to enhance specific characteristics. In bodybuilding, they are used in supraphysiological doses (often 10-20 times typical TRT levels) to achieve extreme muscle mass and very low body fat.
Safer Use Model (AAS)
This is an evidence-based approach to anabolic steroid use that emphasizes managing estrogen levels not primarily through toxic aromatase inhibitors, but by carefully balancing the use of testosterone with other non-aromatizing androgenic compounds like primobolan or masteron.
Longevity Escape Velocity
A hypothetical future point where medical and technological advancements allow humans to extend their lifespan at a rate greater than or equal to the time that passes. This could potentially lead to indefinite lifespans by continuously reversing the aging process.
12 Questions Answered
Endurance training benefits from sub-maximal efforts over long durations, often focusing on zone 2 work, while resistance training relies on applying high forces and pushing muscles to high levels of fatigue for optimal growth and strength gains.
Neural fatigue encompasses the wear and tear, substrate depletion, and neurotransmitter exhaustion in both the central and peripheral nervous systems that occurs when muscles are pushed to their limits during intense resistance exercise, necessitating recovery time.
The relationship between training volume (sets) and muscle growth is curvilinear and hyperbolic; initial sets provide significant gains, but subsequent sets yield diminishing returns, meaning there's an optimal range beyond which more volume offers little additional benefit for disproportionately more fatigue.
Beginners can achieve substantial health and aesthetic benefits by training major muscle groups twice a week for about 30 minutes per session, focusing on compound movements, gradually increasing intensity, and working close to muscular failure (1-2 reps in reserve).
Look for trainers with reputable certifications (e.g., Menno Henselman's PT course), an academic background in kinesiology, and the ability to explain their methods based on scientific principles, in addition to having good personal rapport.
Plateaus can be caused by suboptimal exercise selection, poor technique, insufficient or excessive training volume, not pushing hard enough (too many reps in reserve), or neglecting regular deloads (planned breaks) to manage cumulative fatigue.
These are critical factors: older individuals, those with less favorable genetics, and those with high stress or poor sleep will generally experience slower muscle gain compared to younger individuals with good genetics and optimal recovery conditions.
Consistent intake of sufficient protein (around 1 gram per pound of body weight per day) spread across 3-4 meals, combined with enough calories to support gradual weight gain (about half a pound per week), are the primary nutritional drivers for muscle growth.
Users often exhibit more male-like patterns of thought and behavior, including increased irritability, aggression, heightened focus on dominance hierarchies, reduced empathy, decreased linguistic expressiveness, and significantly elevated sex drive (especially with high estrogen levels).
Risks include cardiovascular damage (e.g., left ventricular hypertrophy), adverse impacts on lipid values, elevated blood pressure, and potential prostate issues, though individual resilience and careful management of these factors can mitigate some risks.
Yes, a significant portion of muscle mass gained through anabolic steroid use, particularly if it pushes beyond one's natural genetic limit, can be permanently retained even after discontinuing the drugs, due to lasting changes like increased satellite cell incorporation in muscle fibers.
Many bodybuilders morally oppose GLP-1 agonists, arguing that the intense suffering and hunger endured during calorie restriction are essential for 'earning' one's physique, despite often using other performance-enhancing drugs themselves.
39 Actionable Insights
1. Prioritize Longevity-Oriented Lifestyle
Adopt a longevity-oriented lifestyle (e.g., healthy eating, exercise, good sleep) to maximize your chances of benefiting from future advancements in age reversal and disease eradication technologies.
2. Minimum Resistance Training Time
Allocate 1-3 hours per week for resistance training to gain health, longevity, and quality of life benefits, with 30 minutes twice a week being a high-return minimum.
3. Consistent Daily Protein Intake
Consistently consume approximately one gram of protein per pound of body weight daily, spread across three to four meals, to optimize muscle gains.
4. Sufficient Calorie Intake for Growth
To support muscle growth, ensure your calorie intake is sufficient to gain about half a pound of body weight per week.
5. Prioritize Nutritional Consistency
Maintain high consistency with your nutrition (sufficient protein and calories) daily, as inconsistency, especially with age and stress, significantly hinders muscle gain.
6. Control Elevated Blood Pressure
If your blood pressure is elevated, prioritize controlling it with medication, as modern drugs are highly effective with minimal side effects and significantly reduce health risks.
7. High-Intensity Resistance Training
For resistance training, push very heavy loads or lighter loads very close to muscular failure to maximize benefits, as this is the primary modality for making you better.
8. Train to 1-2 Reps Reserve
Aim for one to two repetitions in reserve (RIR) on most working sets, as this provides optimal stimulus for growth without incurring disproportionately high fatigue and injury risk compared to training to absolute failure.
9. Whole Body Training Routine
For twice-a-week training, spread sessions evenly (e.g., Monday/Thursday) and train every major muscle group in each session, as whole-body training is best for general health and aesthetic benefits.
10. Prioritize Compound Movements
Select compound, multi-joint exercises (e.g., pull-ups, squats, deadlifts) that engage large muscle masses and multiple muscles simultaneously for time-efficient and effective training.
11. Start Low, Focus Technique
Begin resistance training with low or body weight, focusing on basic competency and fine-tuning technique over perfection to minimize injury risk and build a foundation.
12. Gradually Increase Training Load
Gradually increase weight or repetitions each week after mastering technique, aiming for a physiologically challenging weight and rep combination over time.
13. Use 10-30 Rep Range
Perform sets in the 10-30 repetition range to reduce injury risk, improve cardio-metabolic health, and achieve significant hypertrophy stimulus, especially for beginners.
14. Minimize Rest Times in Gym
Keep rest times between sets minimal (5-10 seconds for transitions) to condense workouts and maximize results for general health and aesthetics, especially when starting out.
15. Pair Unrelated Exercises (Supersets)
To save time and gain cardiovascular benefits, pair exercises that train unrelated muscle groups (e.g., shoulder press with goblet squats), performing sets back-to-back with minimal rest.
16. Implement Regular Deload Weeks
Take a deload week every 6-8 weeks (one week off or very light training) to reduce cumulative fatigue, allow full recovery, and resensitize muscles to training stimulus.
17. Take Annual Active Rest
At least once a year, take two full weeks of active rest (minimal or no gym activity) to completely reset systemic cumulative fatigue and allow for maximal recovery.
18. Intermediate Lifter Volume Guidelines
For intermediate lifters, ensure you are performing at least 10-20 hard working sets per muscle group per week to achieve optimal results.
19. Increase Working Sets Gradually
If recovery is good and strength is stable, gradually increase the number of working sets per exercise from one or two up to three to six over time.
20. Optimize Exercise Technique
Continuously refine your exercise technique to ensure muscles are placed under high force at deep, stretched positions (long muscle lengths) for superior growth stimulus.
21. Incorporate Isolation Work
If you desire specific muscle growth (e.g., bigger arms), incorporate isolation exercises (e.g., curls, tricep extensions) regularly and with sufficient intensity into your training plan.
22. Calibrate Reps in Reserve
Periodically test your limits by training to muscular failure to accurately calibrate your perception of ‘reps in reserve’ and ensure you are pushing hard enough on other sets.
23. Use Objective Training Progression
Implement objective progression by tracking weights and reps, aiming to slightly exceed previous performance each week, which inevitably leads to training close to failure and builds intuition.
24. Manage Growth Expectations Realistically
Contextualize your muscle growth goals and expectations based on your age, genetics, training history, and current lifestyle (stress, sleep, recovery) to avoid frustration and set realistic targets.
25. Seek Certified Personal Trainers
When seeking a personal trainer, look for certifications like the Menno Henselmans PT course, as it indicates a high probability of competence and evidence-based practice.
26. Evaluate Trainer’s Scientific Approach
Choose a trainer who integrates scientific literature and broad basic principles into their practice, rather than relying solely on personal experience or ‘feel’.
27. Prioritize Trainer Rapport
Select a personal trainer with whom you have good rapport and a positive connection, as this can significantly enhance adherence and motivation.
28. Don’t Judge Trainers by Physique
Do not choose a personal trainer based solely on their physique, as their appearance is largely influenced by genetics, diet, and long-term habits, not necessarily superior coaching ability.
29. Prefer Kinesiology Background Trainers
Prefer trainers with an undergraduate degree in kinesiology or a related field, as this often indicates a stronger foundational understanding of exercise science.
30. Evaluate Trainer Advice with AI
Record your trainer’s advice and use advanced AI models (like GPT-4) to evaluate the soundness and evidence-base of their recommendations.
31. Be Ready to Switch Trainers
Be willing to switch trainers if you find their methods ineffective, not aligned with evidence, or if you don’t feel a strong connection after a few weeks or months.
32. Consider GLP-1s for Fat Loss
If appropriate and safe, consider GLP-1 agonists to significantly reduce hunger and achieve lower body fat levels, understanding that they come with potential side effects and don’t eliminate all food focus.
33. GLP-1s Free Willpower Bandwidth
Use GLP-1 agonists to reduce the mental effort required for diet management, freeing up willpower and cognitive bandwidth to focus on other important aspects of life like career or family.
34. Consider Anabolic Steroids
Consider anabolic androgenic steroids for achieving supra-physiological muscle mass and extremely low body fat, but be aware of the wide range of psychological and physical side effects, including potential long-term health risks and the need for meticulous health monitoring.
35. Manage Estrogen with Steroid Choice
(For those using anabolic steroids) Manage estrogen levels by adjusting the ratio of testosterone to non-aromatizing compounds rather than relying heavily on aromatase inhibitors, which are associated with significant neurotoxic and cardiovascular risks.
36. Rigorously Monitor Health During Steroid Use
(For those using anabolic steroids) Rigorously monitor key health metrics like blood pressure and lipid values, and actively manage them to mitigate health risks, especially during high-dose cycles.
37. Consider Fertility Risks with Steroids
Before initiating anabolic steroid use, thoroughly consider your life goals, particularly regarding future fertility, as prolonged use can lead to irreversible spermatogenesis suppression and inability to father children.
38. Understand Permanent Steroid Muscle Advantage
Be aware that using anabolic steroids, even temporarily, can lead to a permanent increase in muscle mass beyond natural limits, providing a lasting advantage that must be considered in competitive contexts.
39. Podcast Premium Membership
To deepen your knowledge of longevity science, consider subscribing to the podcast’s premium membership for exclusive content and benefits.
8 Key Quotes
If you have to be mindful of extremes, in almost every case, you have already been on a multi-years long, very immersive, very infatuated, very disciplined journey of resistance training and focused nutrition and the organization of many variables and parts of your life around that task.
Mike Israetel
The myth of accidental muscle.
Mike Israetel
Weight training is one of those things where you get a dose of it, and for days after, under the hood, it's upgrading your body and your nervous system and your muscles and your tendons.
Mike Israetel
You don't know what two reps in reserve means until you go to failure. You have to fail many times to actually know how bad two reps in reserve is and one rep in reserve.
Peter Attia
The most important factor, other than time spent in the gym, about how jacked and lean you're going to get is genetics.
Mike Israetel
It just doesn't matter why your blood pressure is high, fucking control it with drugs, and then look to lifestyle or whatever or whatever.
Mike Israetel
I believe it is a high probability that in the early to mid 2030s, we will see the fusion of informatics and biology powered by AI, such that we will be able to point-by-point re-engineer the entire human organism at a variety of levels and undo damage like was never possible before.
Mike Israetel
There is a category of bodybuilder who fully endorse the liberal use of anabolic steroids, but oppose the use of GLP-1 agonists vehemently. And the moral argument is you have to suffer through the hunger to earn your right to call yourself a competitive bodybuilder.
Peter Attia
1 Protocols
Beginner Time-Efficient Resistance Training Program
Mike Israetel- Train twice a week (e.g., Monday and Thursday) to allow sufficient recovery between sessions.
- Perform a whole-body workout in each session, training every major muscle group.
- Select compound, multi-joint exercises that engage large muscle masses (e.g., pull-ups, close-grip bench presses, squats, deadlifts, lunges).
- Start with very low weights or bodyweight, focusing on learning and refining technique over the first 3-4 weeks, doing 3-4 'practice sets' per exercise.
- Gradually increase weight and/or repetitions, aiming for 1-2 reps in reserve (RIR) on working sets as technique improves.
- To maximize time efficiency and cardiovascular benefits, pair unrelated exercises (e.g., shoulder press followed by goblet squats) with minimal rest (5-10 seconds transition) between paired sets.
- Perform sets of 10-30 repetitions to minimize injury risk while maximizing hypertrophy and cardiometabolic benefits.
- Aim for 15-30 total working sets per session, working almost continuously with short transitions.
- After 6-8 weeks of consistent training, take a 1-week deload (easy training or no training) to manage cumulative fatigue, then restart with slightly fewer sets to resensitize muscles.