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“Zone 2 training is touted by influential commentators including on podcasts and in popular and social media as the optimal training intensity for improving mitochondrial and fat oxidative capacity, thereby supporting metabolic health and chronic disease prevention.
Our review failed to uncover substantive evidence supporting claims that Zone 2 is superior to higher exercise intensities for improving mitochondrial and fat oxidative capacity…”
quantifyfitness.com/much-ado…
It's out!! I am so excited to share this review addressing popular beliefs and claims within popular media around Zone 2 training. I feel very privileged to have worked on this with my amazing co-authors, Dr. Brendon Gurd, Andres Moran-MacDonald, and @gibalam
Social media has the power to change the way people behave, so it's important that we stay evidence based.
Full text link: surl.li/fpehtb
Vasper is one of the many tools we offer for clients in Nashville to maximize their workouts. @gkittle46 knows what’s up! He just needs to add some ARX (adaptive resistance) so he can cut back on that 4 hours of training!
Man vs Machine 🦾
This video is wild 💀
George Kittle talks about using a Vasper System for his training:
“It knocks you the fuck out at night. You sleep so well and you have wild dreams. The main selling point is that you blow huge loads… That’s how it was sold to players that it boosts your testosterone, you sleep really well, you feel really great, and you’re also going to blow huge loads… In 2019 there were like 6 or 7 49ers coaches doing it all the time. Mike LaFleur, one of our OC was in there all the time. Going to town. Post practice he was the first guy in (to use the machine) to beat all the players. It was hilarious.”
🎥: @BussinWTB
Quantify Fitness 🦾 retweeted
Muscle health matters more than most people realise.
But here’s the catch:
Many people won’t take action unless their doctor tells them to.
So how much do Australian GPs and nurses really know about muscle health?
We surveyed 1,364 clinicians and uncovered a clear gap between belief and action when it comes to sarcopenia - the age-related loss of muscle mass, strength, and function.
Here’s what we found:
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⚠️ Awareness is high - but understanding is low
While most recognised sarcopenia involves low muscle mass, only 16% correctly identified all diagnostic criteria. Over 1 in 3 confused it with including low physical fitness.
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⚠️ Knowledge gaps persist
Most knew resistance training and high protein help. But just 9–12% correctly ruled out aerobic exercise and more fruit/veg as ineffective treatments.
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⚠️ Screening is rare
Only 23% actively assess for sarcopenia - and just 6% screen adults under 60, despite early onset of muscle loss. Many aren’t using validated tools, either.
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⚠️ Clinicians care - but feel underprepared
Over 80% see it as their responsibility to manage sarcopenia. Yet less than 25% feel they have the knowledge to act. Time, confidence, and clinical priorities are major barriers.
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⚠️ They want support
Nearly 95% called for more training. Protocols, tools, and better referral pathways could help translate intention into impact.
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❗ Bottom line:
Clinicians are willing - but many are not yet equipped or supported - to take the lead on muscle health.
And if patients will only act when their doctor tells them to…
Let’s make sure clinicians have the time, tools, and systems to make that conversation happen.
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Kudos to @daly_prof team for leading this work now published in Archives of Gerontology and Geriatrics:
Daly RM, Scott D, Kiss N, Tieland M, Baguley B, Fyfe JJ, Manocha R. Knowledge, awareness, beliefs, attitudes, current practices, and perceptions of responsibility to the identification and management of sarcopenia among Australian general practitioners and practice nurses: A national survey. Arch Gerontol Geriatr. 2025 Jun 6;137:105923.
Would love to work with @FitnessGov to show them how are clients are getting life changing results in minutes a week.
Similar to nutrition, the conventional wisdom on exercise has often lead people down ineffective, inefficient, and harmful paths.
Two things in life are certain: @elonmusk has more kids and Quantify Fitness continues to offer the most efficient, effective, and safest workouts on the planet.
Can’t forget the core!
Have to give @PatrickMahomes and @bobbystroupe a run for the money on some @ProteusMotion trunk rotations. 🦾
xitter.cf/ProteusMotion/status/1…
Oh so you watched Quarterback on Netflix and you wished you got more from @bobbystroupe on his training approach?
Us too 👋
Netflix only gave you a couple minutes. We got the whole deep dive. Catch the full video here ➡️ youtu.be/T8vrLez2jOs
“The only reason the body adapts is because there’s a threat to its survival. Your body doesn’t know what year it is and that “threats” aren’t what they used to be. It just knows you’re pushing it harder, and it wants to survive. The goal, from an evolutionary perspective, is to survive a similar threat in the future. If that threat requires you to run 10 miles, then you’re going to improve your aerobic fitness. If the threat requires you to move something heavy, you’ll get stronger.
Whatever type of exercise you choose to do, and wherever you choose to do it, and however many times a week you choose to do it, one detail matters more than anything else if you want the benefits of high-intensity training: Get outside your comfort zone."
Why Your Body Loves Intense Exercise (Even if You Don’t) webmd.com/fitness-exercise/n… from @WebMD;
Yes it is! 🦾
latimes.com/lifestyle/story/…
Good stuff.
Our favorite tool for rotational and multiplanar movements is @ProteusMotion because it allows us to measure power, strength, and acceleration for any human movement and identity areas of opportunity to build customized workout programs.
Behind the curtain on why the Fitness Formula at Quantify Fitness is so effective in so little time 🦾
👇
Curious how different training intensities and volumes affect mitochondrial growth, capillaries, and VO2max?🚴
Check out our new meta-regression, free to access in @SportsMedicineJ! 📖
Team effort with good friends @MrMoelmen & @AlmquistNicki 💪
Link: link.springer.com/article/10…
We would argue when it comes to exercise, the hack and the work aren't mutually exclusive.
The shortest but hardest workout of your life can also be the most effective. 🦾
Surround your body with soothing infrared therapy that penetrates the body at the cellular level leaving you feeling light and vitalized. Our full-sprectrum infrared is the active ingredient that purifies the body, boosts energy and shrinks belly fat.
Quantify Fitness 🦾 retweeted
We correlated inseason pro pitcher fastball velocity with test scores from our @ProteusMotion Cressey Power test. PNF D2 Extension, (Rotational) Shotput and Vertical Jump had the highest correlations with FB velocity. We discuss in the latest podcast: ericcressey.com/will-waterma…
Achieve the benefits of a 2 hour workout in 21 minutes with Vasper 💪🧊
Vasper combines compression, cooling, and intervals to drive the production of growth and recovery hormones, delivering the most significant benefits of high-intensity exercise in an efficient low-impact 21-minute workout.
Help your body restore, harmonize and reach peak vitality on Vasper at Quantify Fitness. 🦾
Zone 2 is all the buzz these days but good chance a lot of people are wasting time...
"40% of individuals that do the recommended 150 minutes of moderate cardio per week show no improvement in VO2max.”
And your muscles are where the action is, not the cardiopulmonary system.
We now know that the muscles are where the action is when it comes to heart health. In fact, it appears almost impossible to access or stimulate the heart and lungs for the purpose of administering an exercise stimulus without the involvement of the muscles.
The harder the muscles are made to work, the greater the cardiovascular adaptations.
An elegant study was performed in 1976 in which the experimenters recruited thirteen subjects and trained them on a stationary bike. But crucially, each participant only trained one leg the entire time.
The trained leg employed a sprint and/or a low-intensity steady-state protocol. The subjects performed four or five of these workouts per week for four weeks.
After the study, when the researchers tested the subjects’ VO2max by having them repeat the exercise with the trained limb, they noted an increase in VO2max of twenty-three percent.
This one-legged exercise was supposed to produce a full-body cardiovascular adaptation, but when the experimenters tested the subjects’ untrained legs, they discovered that the untrained limbs showed no improvement in VO2 max at all.
But wait a minute. If “cardio” improves the heart and the lungs, shouldn’t the full body receive this VO2max benefit? Why didn’t the heart and lungs confer that improvement to both legs?
The answer is the same point that was made above, which is that when an improvement is observed in someone’s “cardiovascular fitness,” what’s actually being observed is an improvement inside the muscles—not the heart or lungs. The muscles are where the action is.
This is why jogging will give you a better result than walking, running will give you a better result than jogging, and sprinting will give you a better result than running.
A greater demand is being placed on the muscles as you move faster, and as a result, the cardiovascular adaptations become more robust.
Come on @elonmusk!
"The most common error of a smart engineer is to optimize a thing that should not exist."
xitter.cf/elon_docs/status/18109…
You can do better than modern architecture with neon lights. The gym of the future doesn't have "dumb"bells.
Shoot us a DM. We'll help you build a smartgym from the future where your employees can optimize (and quantify) their health and fitness in less time. You don't ride a horse to work so why are you still using old-fashion exercise?! 🦾





















