This podcast is hosted by Tim Karajas, an ex-Physiotherapist turned Personal Trainer. Tim is Head Coach and Owner of Extension Fitness.
The focus of this podcast is on:
- health & fitness for middle aged and older adults
- improving performance & enjoyment for recreational distance runners
- other eclectic topics which interest the host!
About Extension Fitness:
Extension Fitness is a family owned, boutique personal training and running coaching service in Perth, Western Australia.
We help middle-aged and older adults improve their health through strength training.
We help recreational runners get faster and reduce injury risk. We do it through technique assessment & coaching, online running coaching via Final Surge and strength training.
Dr Julie Manasseh (Medical Weight Loss Specialist) Weighs In On Obesity
Dr Julie Manasseh (Medical Weight Loss Specialist) joins Tim Karajas to discuss why its so hard to lose weight.
They also cover:
The set point
Why obesity is such a major issue
Diet culture
The health consequences of obesity
And more...
19 Mar 2026
A Discussion With Troy Walker - First Nations Senior Research Fellow - Covering Commercial Determinants Of Health, GLP-1 Medications, Turf Wars Between Physio & Chiro & MORE
Troy is a Yorta Yorta man, an experienced registered chiropractor, strength and conditioning coach and senior research fellow with a demonstrated history of working in Aboriginal health, clinical health, wellbeing, nutrition and physical activity.
He is active in - and passionate about - nutrition research and practice, clinical pain management, Aboriginal lifestyle health, social and emotional wellbeing, photobiomodulation and neuromusculoskeletal rehabilitation.
Troy and I have enjoyed getting to know each other on LinkedIn.
In this discussion, we chatted about:
Commercial determinants of health
GLP-1 medications
What Troy loves & loathes about his research
The turf war dynamics between Physios and Chiros
Pseudoscientific clinical reasoning in past Physio education
12 Feb 2026
Jackson Fyfe - Exercise Science Lecturer - Wants To Persuade The Public To Exercise.
Today I chatted with Jackson Fyfe - Senior Lecturer, Strength and Conditioning Sciences, Deakin Uni Melbourne.
He's a thoughtful practitioner of translating exercise science for the general public and a lovely bloke, to boot.
We chatted about:
1/ Why do we find it so challenging to exercise?
2/ Is there even such a thing as "optimal" exercise?
3/ Why exercise and movement doesn't need to be rigid or complicated to impart a big benefit.
4/ Do tradies need to do structured training, too? Even if their jobs are really physical?
5/ How much of a difference can it make in your life for you to exercise?
6/ Why chasing "optimal", as opposed to what feels good for you, can be a dead end.
7/ Is the point of exercise science research to help people exercise (implementation science)? Or to uncover new knowledge (basic science)?
8/ Some cool physiology stuff:
the systemic benefits of exercise
myokines
9/ Why do GPs reach to the subscription pad so readily?
10/ Why people over 50 should lift weights
21 Feb 2025
Hugo Van Der Broek (Running Coach In Kenya & 2:12 Marathoner) Gives The Lowdown On Aerobic Base - PLUS: Why Come TO Kenya?
Hugo Van Den Broek is an ex-professional runner (PB Marathon = 2:12) who lives and works in distance running Mecca, Iten (Kenya).
From there, he coaches Kenyan athletes (and others - me included - online).
He also runs Kenya Running Camps (https://www.kenya-camp.com/).
These camps are for runners of all sorts, from the complete novice to the seasoned marathoner.
They offer you a chance to train in a camp setting for a good chunk of time, but more importantly, they give you a chance to learn how to level up your distance running (training, lifestyle, mindset) by learning from the best.
Hugo kindly shared his time to talk about THE AEROBIC BASE.
You may have heard about it, but what is it? Really?
We discussed:
1/ What is the base?
2/ Why is it important for distance running success?
3/ Which events is it especially relevant for?
4/ How can runners evaluate their base?
5/ How can runners build their base?
I hope you enjoy it!
2 Feb 2025
Dan Williams Gives You The Right Framework For Building A Long Term Exercise Habit (AND Success In Business)
Dan Williams is a Perth-based Exercise Physiologist and Business Coach.
A veteran of helping people to create a durable long term exercise habit, Dan shares his reflections on what works and what doesn't.
Dan is one of the most naturally curios people I know, and I have benefited a lot from his business mentoring.
Check out his gym: https://rangeofmotion.net.au/
Check out his business mentoring: https://dwbc.au/businessmentoring/
30 Jan 2025
Dane Verwey (Physio & 2:22 Marathoner) Is Here To Sort Out Your Running Injuries & Technique
Dane and I enjoyed a chat about running injuries.
What are the major causes?
What are simple things that can be done to prevent and manage them?
Then we talked about running technique - a shared passion.
Dane's In-Person & Online Clinic: https://www.runculture.org/run-therapy
Dane's (Excellent) Podcast: https://www.runculture.org/runculture-podcast
Running Biomechanics Course: https://mechanicsofmovement.fitterapp.app/programs/running-biomechanics-dfc
19 Dec 2024
David Beard On Refurbishing Your Metabolism For Weight Loss
Exercise Physiologist David Beard shares insights on refurbishing metabolism for weight loss, highlighting the importance of metabolic flexibility, hunger management, and low-carb diets for sustained weight loss.
25 Nov 2024
Did Peter O'Sullivan Push Me Off Mount Stupid?
You may have heard of the Dunning Kruger Effect?
It describes how your confidence to speak about something increases as you gain competence.
But, noticeably, when you start to gain competence, your confidence can spike way too high too soon out of proportion with your experience and expertise, placing you atop "Mount Stupid". Then, as you gain more competence, you can descend into the "Valley Of Despair" as you realise there's a lot more to your field than you had thought.
Descending into the valley of despair can be marked by embarrassment on how you've been holding forth with strong opinions, stridently preaching to the world with way too much self-assurance.
After shooting my mouth off on LinkedIn regarding issues in modern day science, and understandably drawing a fair degree of pushback from people engaged in research for their day job, I have become personally acquainted with Mount Stupid.
Pete O'Sullivan (Physiotherapist - Body Logic & Curtin University), who's a personal friend plus one of my online adversaries & interlocutors on this issue - kindly agreed to have a chat about his own perspective as an active researcher.
This discussion with Pete provides his perspective on the trustworthiness of modern empirical research in allied health.
It resulted in an increase in my own confidence that contemporary research published in high quality peer reviewed journals can be trusted.
Podcast Authority Score: 22 / 100
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