Iron Culture Podcast

Ep 394 - Common Movement Questions

4.4K views · 2d ago · 1:25:35

Iron Culture co-hosts Eric Trexler and Eric Helms answer four common questions about movement and lifting. Topics include anterior pelvic tilt, tibial torsion and asymmetry, butt wink, and Smith machine squats. They explain why recommendations depend on symptoms, experience, and goals, and why comfortable individual movement often matters more than enforcing "perfect" movement patterns.

Topics: Anterior pelvic tilt · Why muscle-balance ratios can mislead · Tibial torsion and asymmetrical stances · A constraints-led approach · Butt wink · Squat depth, adaptation, and individual goals

Ep 393 - When Science Isn’t Ready for "Prime Time"

4.2K views · 1w ago · 1:12:46

Trexler and Helms step back from training specifics to talk about how science gets interpreted, communicated, and applied. Trexler opens with two anecdotes that exposed a blind spot in his own communication — a one-minute clip of a talk on the Minnesota starvation experiment that drew online backlash, and a classroom tangent on macaque calorie-restriction research that a colleague worried could nudge students toward disordered eating — both cases where true, interesting…

Topics: Interpreting, communicating & applying science · Anecdote: a clipped talk & the starvation experiment · Anecdote: the macaque calorie-restriction tangent · Academic ideas vs. "ready for showtime" · What talks outside fitness taught him · Science needs story: "Houston, We Have a Narrative"

Ep 392 - Training Frequency for Hypertrophy

6.5K views · 2w ago · 1:20:20

Trexler and Helms dig into training frequency and hypertrophy, prompted by a wave of recent discussion and two new papers: a new original study comparing three weekly sessions of three sets against one session of nine, and a new preprint from an independent research team utilizing the openly available data from Pelland’s previously published meta-regression.

Topics: Tonight's topic: frequency & hypertrophy · A history of the frequency debate · Where the science had settled · The new claim & study under the microscope · The state of the science · Distributing volume & managing fatigue

Ep 391 - What Can You REALLY Learn From Pre-Steroid Era Bodybuilders? (with Dr. Conor Heffernan)

5.2K views · 1mo ago · 1:46:26

Guest: Dr. Conor Heffernan

This episode looks at bodybuilding before steroids became widespread, arguing that the era is far more useful (and more complicated) than the usual “pure, simple, natty golden age” story. Drs Eric Helms and Conor Heffernan break down how strength sport, judging standards, gym access, and culture shaped physiques from the 1940s through the 1950s. The big takeaway is that early bodybuilding was not a direct comparison to modern natural bodybuilding.

Topics: The "pre-steroid era" myth · Using history to break the rules · When did steroids actually arrive? · Were the silver-era physiques natural? · What the average lifter really looked like · Why old physiques look so different

Ep 390 - Is Muscle Loss Really a Big Deal?

7.8K views · 1mo ago · 1:08:36

Bodybuilders are laser-focused on retaining as much muscle as possible while dieting, and for very good reason. In that context, the smallest details matter. But what about everybody else? This episode explores a hot take on weight loss, lean mass loss, and why the usual fear of losing muscle may be overstated in the context of successful long-term weight loss.

Topics: Helms' hot take on losing lean mass · Defining lean mass loss · Why obesity increases fat-free mass · Temporary versus lasting muscle loss · DEXA versus MRI measurements · Prioritizing function and quality of life

Ep 389 - What the Erics Actually Do

4.9K views · 1mo ago · 1:38:40

In this episode, Eric Helms and Eric Trexler share their current approaches to diet, training, and supplementation, emphasizing pragmatic strategies, individualization, and the importance of evidence-based practice. They discuss how constraints, habits, and intrinsic motivation shape their approaches to fitness, offering valuable insights for both athletes and everyday lifters.

Topics: Eric Helms discusses his role as co-director at Sprints · The importance of legacy and impact in fitness and research · Transition to practical training and nutrition strategies · Current training routines and scheduling challenges · Training volume, frequency, and adaptation · Fasted training, resilience, and human adaptability

Ep 388 - What Most Bodybuilders and Their Coaches Miss (ft. Richard Collins)

4.8K views · 1mo ago · 1:35:42

Guest: Richard Collins

In this episode, Eric Helms and Richard Collins explore the art and science of coaching, emphasizing the importance of motivation, rapport, and tailored strategies in achieving long-term success in fitness and bodybuilding. In this episode, Richard shares his extensive experience in physique sport coaching, mental performance training, and how athletes and coaches can optimize their mindset and preparation for peak performance.

Topics: What is coaching and why it matters · The importance of motivation and internal drive · Building rapport and trust with clients · Transition from sports to bodybuilding coaching · Differences in motivation between athletes and general clients · Creating internal motivation in clients

Ep 387 - Energy Cost of Building Muscle

7K views · 2mo ago · 1:02:05

In this episode, Eric Trexler and Eric Helms explore the energetic cost of building human skeletal muscle, discussing recent research, practical implications, and misconceptions about muscle growth and energy expenditure.

Topics: Powerlifting shout-out · Components of muscle tissue building and their energy costs · Practical implications of the 3500 calorie rule · The five additive components of muscle growth energy cost · Variability in individual energy expenditure responses · Limitations and future directions in research

Ep 386 - Sleep, Hypertrophy, and Creatine

3.2K views · 2mo ago · 1:19:14

Trexler and Helms dig into sleep and how it intersects with body composition and supplementation. They open on the sleep-and-lifting landscape, then work through the frequently cited 2010 study on insufficient sleep and fat loss, laying out its design and the details behind its dramatic-sounding numbers.

Topics: Sleep & body composition · Unpacking the famous 2010 sleep study · The blind spot in the sleep literature · Sleep restriction, power, skill & pain · Sleep duration vs. sleep efficiency · The big takeaway on sleep & gains

Ep 385 - Do Studies on Untrained Lifters Apply to Trained Lifters?

2.7K views · 2mo ago · 1:18:26

Trexler and Helms dig into Helms's new MASS article, "Are studies on untrained lifters irrelevant to trained lifters?" It's built around a new umbrella review by Andy Fry and colleagues. The recurring internet claim is that most exercise research is done on untrained people, so a trained lifter is "built different" and the findings don't apply. The hosts unpack why that's mostly wrong. They start with the messy problem of defining how "trained" someone is.

Topics: The article: do untrained studies apply? · What does "trained" even mean? · How researchers try to define training status · Fry's approach & the McKay tiers · A review of reviews: mapping the literature · The finding: 70% untrained

Ep 384 - Is Ultrasound Lying About Your Gains?

2.1K views · 3mo ago · 1:22:41

A methods-focused episode about how muscle and body-composition measurements can mislead you when reading the research. The main event is a new Balshaw and colleagues paper concluding that ultrasound muscle thickness is a poor index of MRI-measured muscle growth.

Topics: The paper: is ultrasound a poor muscle-growth measure? · What muscle thickness actually captures · Measurement error vs. a tiny signal · Different dimensions, different devices · What researchers should do about it · Case study: does sleep loss "kill gains"?

Ep 383 - Q&A: Imbalances, Fatigue, & REDs

2.9K views · 3mo ago · 1:05:43

In today's Q&A episode, the Erics work through a few listener questions. First they tackle upper/lower body imbalance — why lagging body parts usually call for improving training quality before adding volume, and why standout muscle groups can be maintained on surprisingly little work.

Topics: Fixing upper/lower body imbalance · Quality before quantity · Why standout muscles hold with less work · Fatigue & sequencing high-frequency training · How to actually sequence back-to-back days · Lifting "rules" set in concrete

Ep 382 - The Science of Building Bone (ft. Dr.Lora Giangregorio)

1.9K views · 3mo ago · 1:26:24

Guest: Dr.Lora Giangregorio

The Erics sit down with bone health expert Dr. Lora Giangregorio, a professor of kinesiology at the University of Waterloo, to unpack what's actually known about how bone adapts to resistance training. The conversation covers why bone changes so slowly, the many sources of measurement error in DEXA scans, and why so much of the exercise-and-bone literature is underpowered and hard to interpret. Dr.

Topics: Meet Dr. Lora Giangregorio · Why bone adapts so slowly · DEXA error & why to be skeptical · Does load matter? · "Heavy" vs "hard" & barrier to entry · What is impact training?

Ep 381 - Q&A: GLP-1s, Tendon Training, & Rep Ranges

4.4K views · 4mo ago · 1:16:13

Trexler and Helms open with an overview of the new MASS issue (body recomposition, a protein consensus paper, reverse dieting) and a powerlifting World Championships recap before diving into a rapid-fire listener Q&A.

Topics: Powerlifting news: World Championships & squat records · Do protein requirements scale with training volume? · PGX: is "Nature's Ozempic" actually legit? · Protein quality & % Daily Value on food labels · Chasing endurance adaptations while dieting in a deficit · Protecting tendons & bone when leaving powerlifting

Ep 380 - Bulking, Cutting, and Recomping

7.7K views · 4mo ago · 1:20:52

In this Q&A episode, Eric Trexler and Eric Helms open with a recap of their trip to Norway and announce a new MASS partnership with AFPT International. They then work through a string of listener questions that end up forming a surprisingly cohesive arc: how much total daily energy expenditure actually varies between people, RED-S and low energy availability, what really drives satiety, and a deep dive into building or retaining muscle in a calorie deficit.

Topics: Q&A begins: Is maintaining 2400 cal "above the mean"? (TDEE variance) · RED-S, low energy availability & the female athlete triad · What actually drives satiety? · Building muscle in a deficit: protein needs & why muscle is lost · What bulking studies tell us about surplus size · Listener case study: bulk first or recomp while cutting? (Natalia)