Stronger with Time

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The principles that drive adaptation in the world's best endurance athletes are the same principles that drive adaptation in people who train seriously but are not competing. The application changes. The fundamentals do not.
Dr Dan Plews is an applied sports scientist, coach and world-class endurance athlete. He holds a doctorate in applied heart rate variability from Auckland University of Technology, has coached athletes to more than 30 world and Olympic titles, and has set records at both the Ironman World Championship and in HYROX.

In this episode, we discuss:
Why the gap between elite endurance science and everyday training is smaller than most people think. The framework Dr Plews uses with Olympic athletes, identifying the gap between current capacity and the target and then designing training to close it, applies equally to someone training six hours a week for health and longevity.

Whether the concurrent training interference effect actually matters for non-athletes. Dr Plews explains that while the interference effect is real, it primarily matters at the highest levels of performance. For most people training six or fewer hours a week, getting the work done in a recovered state matters more than the sequencing of strength and endurance sessions.

What zone two training actually is and where the common misconceptions come from. Zone two is defined by physiological markers, not by feel or a percentage of maximum heart rate, and most people who think they are training in zone two are working considerably harder than the research supports.

How heart rate variability reflects the state of the autonomic nervous system and why it is one of the most useful tools available for managing training load and recovery. Dr Plews explains how to interpret HRV trends over time, what a suppressed morning reading actually tells you, and how to use it to make better daily training decisions.

How low carbohydrate approaches and fueling strategies affect endurance adaptation, why metabolic flexibility matters for both performance and long-term health, and what the evidence shows about carbohydrate availability during training and competition.

Why Dr Plews shifted his focus from long-course triathlon to HYROX, and what that shift reflects about building a broader fitness base for longevity rather than optimising for a single performance output.

Key insight:
Elite endurance athletes succeed by applying the right stimulus at the right time and recovering properly between sessions. That principle does not change when you have six hours a week instead of thirty. The gap between what the best coaches in the world know and what everyday people apply is smaller than it looks, and this episode closes it.

Topics: zone two training, concurrent training, interference effect, heart rate variability, HRV, endurance training, polarised training, low carbohydrate training, metabolic flexibility, fueling for endurance, HYROX, triathlon, longevity and exercise, training load management, strength and endurance, applied sports science

Female athlete health is often discussed in extremes: either physiology is underplayed, or every difference gets turned into a rule.
This conversation sits in the middle, where evidence, clinical context and nuance matter.
In this episode of Stronger With Time, Tony speaks with Dr Kathryn “Kate” Ackerman, a former elite rower, sports medicine physician, endocrinologist and leading researcher in female athlete health.
Kate’s work sits at the intersection of sport, medicine, endocrinology and performance. She explains how her own experience as an athlete shaped her career, why the data gap in female athletes still matters, and how better research can improve both health and performance.
Tony and Kate discuss RED-S, low energy availability, menstrual dysfunction, bone stress injuries, fueling, carbohydrate availability, hormone therapy, menopause, and how to think about female athlete health without turning every difference into a rule.
They also explore the nuance often missing from online discussions: not every calorie deficit is RED-S, not every female athlete needs a bespoke training plan based on physiology alone, and the goal is not to create fear, but to understand what the evidence can and cannot tell us.
In this episode, they cover:
The evolution from the Female Athlete Triad to RED-S

What low energy availability means, and when it becomes a problem

Why RED-S requires clinical nuance, not just symptom counting

Screening tools, clinical markers and medical context

Bone stress injuries, DEXA, HR-pQCT and delayed bone recovery

Transdermal estrogen, oral contraceptives and bone health in amenorrheic athletes

Adolescent athletes, loading, fueling, calcium, vitamin D and stress injury risk

Carbohydrate availability, meal timing and recovery

Menopause, HRT and the gaps still left in women’s health research

Why female physiology matters, without turning everything into a sex-specific rule

This conversation is for coaches, clinicians, female athletes, parents of young athletes, and active women who want a clearer, evidence-informed understanding of female athlete health.

Resources:
WHSP Institute: https://whspinstitute.org/WHSP Medical: https://www.whspmedical.com/Dr Kate Ackerman bio: https://www.whspmedical.com/dr-kate-ackermanIOC REDs CAT2 / BJSM article: https://bjsm.bmj.com/content/57/17/1068Dr Kate Ackerman Instagram: https://www.instagram.com/drkateackerman/WHSP Institute Instagram: https://www.instagram.com/whsp_institute/
Tony’s website: https://tonyboutagy.com/Tony Instagram: https://www.instagram.com/tonyboutagy/

All content is for general educational purposes only and is not intended as medical advice.

Hypertrophy advice can become confusing fast.

Different studies, different coaches, different physiological models and different claims online can point to slightly different answers. Sets, reps, frequency, failure, soreness, exercise selection and periodisation are all debated, often with more certainty than the evidence allows.

In this episode of Stronger With Time, Tony brings together close to four hours of conversations with leading hypertrophy researchers and turns them into a practical framework for coaches and serious lifters.

Across the series, Tony explored muscle hypertrophy through three lenses: the history of strength and hypertrophy training with Professor William Kraemer, the molecular and mechanistic side of muscle growth with Professor Michael Roberts, and practical programming decisions with Dr Eric Helms.

This episode is the synthesis.

Tony distills the key takeaways into what current evidence suggests about how muscle grows, which variables deserve the most attention, and how that translates into real-world program design.

In this episode, we discuss:
The three main worldviews coaches use to program hypertrophy

Why outcome-based research can be difficult to apply directly to long-term training

What muscle hypertrophy is, including radial and longitudinal growth

Why mechanical tension sits at the centre of current hypertrophy thinking

Where DOMS, “the burn” and acute hormonal spikes fit in

Minimalist vs maximalist approaches to training volume

Why no single exercise can train every fibre within a complex muscle group

Practical implications for pec, delt and glute exercise selection

Training frequency, weekly sets and proximity to failure

How to think about drop sets, supersets, rest intervals and rep ranges

Periodisation, fatigue management and training at longer muscle lengths

Who this is for:
Coaches, PTs and S&C coaches programming hypertrophy for clients or athletes

Serious lifters who want their training aligned with current evidence, not trends

Practitioners who care about long-term strength, muscle and joint health

Gym owners who want clear hypertrophy principles their teams can apply consistently

About Dr Tony Boutagy:
Dr Tony Boutagy is an exercise scientist and strength coach with over 30 years of in-the-trenches experience. He is known for bridging hypertrophy and strength research with real-world programming for athletes, general population clients and serious lifters, with a focus on sustainable strength, hypertrophy and conditioning grounded in solid science.
About Stronger With Time:
Stronger With Time is Tony’s podcast on evidence-informed strength, hypertrophy and conditioning across the lifespan, helping coaches and lifters turn complex research into practical training decisions.
Resources:
Advanced Program MasteryTony’s course on long-term program design, periodisation and building training systems that get clients results across years, not weeks: https://tonyboutagy.com/advanced-program-mastery-course-page
Fat Loss FundamentalsTony’s course on designing fat loss phases that preserve muscle, manage energy availability and produce results that hold: https://tonyboutagy.com/fat-loss-fundamentals-course-page

Follow Tony on Instagram: @tonyboutagy

All content is for general educational purposes only and is not intended as medical advice.

Hypertrophy programming comes back to a few practical decisions: how close to failure, how much volume, how often, and how much variety.

In this episode, I speak with Dr Eric Helms about how to make those decisions with better judgment, and where popular models claim more than the evidence supports.

Dr Helms is a PhD researcher in strength and hypertrophy, a coach of physique and strength athletes, and a high-level natural bodybuilder.

In Part 1, we discussed how to think about training advice when coaches, research, and physiology models do not point in the same direction. In this episode, we apply that thinking to programming.

Some of what we discuss:
How close to failure you actually need to train, and when it matters more or less

Why “only the last 5 reps count” doesn’t hold up

Why estimating reps in reserve gets harder at higher reps

How much volume to use, and how frequency changes that decision

Why fatigue matters, but may be overweighted in programming decisions

Variety vs variation, and why hypertrophy may not need strength-style periodisation

Where drop sets, rest-pause, and myo-reps actually fit, as time-saving tools rather than superior methods

Who this is for:
Coaches programming hypertrophy for general population or athletes, and experienced lifters trying to make defensible decisions about failure, volume, frequency, and exercise selection without chasing every new trend.

Guest and Resources
Dr Eric Helms3D Muscle Journey: https://www.3dmusclejourney.com/about/The Muscle and Strength Pyramids: https://muscleandstrengthpyramids.com/Research profile: https://www.researchgate.net/profile/Eric-Helms-2MASS Research Review: https://massresearchreview.com/about-us-2/

Host: Dr Tony Boutagy
Exercise scientist and coach translating exercise science into practical training and programming decisions.Instagram: @tonyboutagyCourses, seminars, and resources: https://tonyboutagy.com/

If you coach or train seriously, you have probably had to weigh different sources of training advice against each other.
A successful coach recommends one approach. A research paper seems to suggest another. A physiology-based explanation points somewhere else.
In this episode, I speak with Dr Eric Helms about how to think through those conflicts without becoming dogmatic about any one source.
Dr Helms is a PhD researcher in strength and hypertrophy, a coach of physique and strength athletes, and a high-level natural bodybuilder.

Some of what we discuss:
Why success leaves clues, not answers

What we can and can’t learn from successful athletes and coaches

Why individual hypertrophy studies can seem to conflict

How to use reviews and position stands without outsourcing your judgement

When physiology-based explanations sound more certain than the evidence allows

This is the first part of a longer conversation with Eric. The second part moves further into the practical programming questions.

Guest and Resources
Dr Eric Helms
3D Muscle Journey: https://www.3dmusclejourney.com/about/

The Muscle and Strength Pyramids: https://muscleandstrengthpyramids.com/

Research profile: https://www.researchgate.net/profile/Eric-Helms-2

Resources mentioned:
Stark Center for Physical Culture and Sports: https://starkcenter.org/

Iron Game History journal: https://starkcenter.org/research/iron-game-history

Host:
Dr Tony BoutagyExercise scientist and coach translating exercise science into practical training and programming decisions.Instagram: @tonyboutagyCourses, seminars, and resources: https://tonyboutagy.com/