The current physical activity guidelines undervalue vigorous activity. Vigorous activity may be 4–9× more potent than moderate activity for reducing all-cause mortality, cardiovascular disease, diabetes, and cancer risk. The exercise guidelines assume a 2:1 ratio between moderate- and vigorous-intensity activity: two minutes of moderate activity equals one minute of... vigorous. That's why the recommendations are 150–300 minutes of moderate or 75–150 minutes of vigorous activity each week. But new data suggest that ratio is wrong. In this brand-new journal-club episode, Brady Holmer (Brady Holmer) and I unpack a groundbreaking study that should change how we think about activity for disease prevention. The research identified that 1 minute of vigorous activity is roughly equivalent to 4–9 minutes of moderate activity, and 53–94 minutes of light activity, for disease risk reduction. It also shows a clear dose-response for vigorous activity that’s much weaker for moderate activity and barely detectable for light activity. We also do a deep dive into why vigorous activity is so powerful, the underlying mechanisms, and discuss practical takeaways, including how even very brief bouts of vigorous movement (think “exercise snacks”) can produce meaningful health benefits. Timestamps are below. You can find links to the episode on YouTube, Apple Podcasts, and Spotify in the next post. Enjoy! Timestamps: 0:00 - Introduction 2:14 - The 1:2 rule for exercise 6:28 - What counts as vigorous? 8:48 - Where exercise guidelines fail 9:32 - Inside the wearable-based study design 15:24 - Vigorous activity—easier than you think? 18:01 - Avoiding healthy user bias 19:12 - A better way to measure exercise 20:58 - Is vigorous 4–10x better? 25:08 - One vigorous min vs. one-hour walk 27:15 - Are light activity's benefits capped? 29:03 - Is vigorous 5x better for your heart? 30:12 - Does zone 2 count as vigorous? 31:24 - Dose-response comparison 32:35 - Vigorous exercise & younger arteries 38:29 - Why aging hearts need intensity 41:22 - Can intensity preserve VO₂ max? 42:40 - Moderate exercise & VO₂ max limits 44:34 - Is vigorous 10x better for diabetes? 51:01 - Why intensity boosts mitochondria 56:11 - Does intense exercise kill tumor cells? 1:02:28 - Hormonal benefits 1:03:19 - Preventing falls with intensity 1:07:49 - Fighting inflammation 1:09:42 - High-intensity training & brain aging 1:11:14 - The 2:1 ratio is out the door 1:13:03 - Could vigorous exercise become a pill? 1:14:21 - Short bursts for longer life 1:18:28 - Can short bouts match full workouts? 1:22:39 - Do wearables undervalue vigorous bursts? 1:25:19 - Can micro-workouts replace the gym? 1:30:23 - Updating exercise guidelines 1:41:48 - Is light activity useless? 1:44:17 - Is vigorous exercise safe for seniors? 1:48:41 - Is HIIT harmful to female hormones? 1:54:18 - Balancing intensity & recovery (80/20 rule) 1:56:43 - Brady’s exercise routine 2:00:30 - Vigorous activity & kids’ brainpower 2:03:27 - Are we undervaluing vigorous exercise? 2:05:16 - Why chasing steps doesn't workshow more

Listen to this episode on: YouTube: Spotify: Apple: Show notes:

Walking is a good thing to do, but it’s not exercise. And exercise is critically important for health.

This really matches what I see in practice: vigorous movement changes the body much faster and more deeply than moderate activity. It isn’t just “twice as good”- it acts on systems that slow exercise never really touches. Why it’s so effective: • Your mitochondria respond to strong signals, not long sessions. Short bursts of harder effort boost energy production and protect VO₂ max far better than steady walking. • Your arteries need intensity to stay young. Vigorous exercise creates enough pressure and blood flow to improve nitric oxide and keep vessels flexible. • Blood sugar improves quickly. Even 20–60 seconds of hard effort helps muscles absorb glucose without needing as much insulin — a huge win for metabolic health. • Inflammation drops. The brief stress of vigorous activity produces an anti-inflammatory effect that light exercise doesn’t deliver. • The brain benefits too. Harder efforts increase BDNF and other chemicals that support mood, focus, and long-term brain health. The point isn’t to do endless HIIT - it’s that small doses of intensity sprinkled into your week can deliver far greater health returns than most people realise.

Correlation does NOT equal Causation.

In the episode, we walk through the methodology in detail and are very clear that this was an observational study, including the nuances of how intensity was defined. The claim that it proves “sprinting will save your life" was never made. That’s a mischaracterization of what was said. The findings are consistent with a larger body of work on higher-intensity activity and longevity and explicitly framed as context and possible mechanisms, not as proof from this single study. If you revisit the episode, I think you’ll see that distinction is made pretty clearly.

None of your posts made it clear that this information was based on observational data and cannot prove causation. So, while you may have discussed this in a 2 hour podcast it was not clearly stated in any of your posts which is what 99% of people are actually seeing.

@foundmyfitness I was confused myself about some comments made on the podcast, but Brady Homer just posted a short video expressing his thoughts about the podcast and making it more clear. It is worth going on his timeline and checking it out 👍

@foundmyfitness Well yeah he just posted a clarifying video because they didn’t make it clear off the bat that none of these findings can actual prove causation and so there’s been backlash. Nothing was ever made clear in any of the original posts.

Young people preaching to us old people. Light exercise, moderate exercise, intense exercise. The bottom line is just get exercise, the more and the longer the better. For a lot of elderly people intense exercise is out of the question because of back, knee, etc. issues. Time takes a toll on the body.

great info!

Thank you Jordan! Glad you enjoyed this episode.

@drjordanmetzl I have a question: in your video about all the benefits of coffee, you recommended drinking two or three cups a day; I would like to know how many milliliters a cup is in this statement. Thks

@drjordanmetzl @grok what are your thoughts here

@foundmyfitness @drjordanmetzl In Dr. Rhonda Patrick's coffee discussions, a "cup" typically means 8 oz (about 237 ml), based on standard nutritional studies. For example, 2-3 cups would be 474-711 ml daily. Check her specific video for exact context, as cup sizes can vary!

@foundmyfitness @drjordanmetzl Thks @grok, I asked because in her video that info was not provided.

@foundmyfitness @drjordanmetzl You're welcome! That's fair—many of her videos reference studies without specifying cup size. In those studies, it's usually 8 oz (237 ml) per cup. If you share the exact video, I can dig deeper.

I want it to be true...but it is based on a 1 wk observational study in a non-representative sample. That being said, my recommendations of HIIT will remain unchanged.

Rhonda weren't these results shown in subjects with a sedentary baseline? I'm wondering if any of this holds up in those of us who are already strength training, doing adequate zone 2, etc.

@Brady_H @foundmyfitness I've wanted this for a long time. I am gonna savour it by watching it slowly- repeating-after a few minutes.

This stuff is awesome, wish these messages were more widely spread.

@grok : what could be the definition of a vigourous exercise in this discussion, and how many minutes per week is recommended

Loving the attention to detail on the post. You rarely see this on ☓...

cc @gregmushen

thank you for sharing here doctor I so am happy to be able to watch this on x

Am curious re how this is so different to what long-lived people in the Blue Zones did (steady, non-vigourous work and likely a lot of movement most of the day). I know clean food, community, faith, outdoor life sunshine were also factors that contributed to their longevity.

This study perfectly explains why my 2-minute stair sprints leave me feeling sharper and more energized than longer moderate sessions. The shear stress and lactate benefits are game-changers for mitochondrial health—thanks for highlighting this.

Slow movements with lots of rest in between sets and/or low intensity are better than doing nothing but robust health requires vigorous activity A giant bicep does not = health

I suppose people who can exercise "vigorously" for a significant period of time are already poised to live longer even without the vigorous exercise.

This really challenges the traditional 2:1 guideline. Short bouts of vigorous activity seem far more powerful than we thought. Great breakdown of the data.

Doubt it. Probably correlation, not causation

Is there still any value in doing 60 min doses of zone 2 cardio? Should I switch entirely to Norwegian 4x4s?

Facts. Go hard or go home, same as startup hustle.

Yeah…my fitness app is telling this and ready to go!

Look away @gregmushen 🫣

Hey Rhonda, how come none of the worlds oldest living people do this?

Walking for exercise is retarded. Walking is the bare minimum. Walking is recovery between exercise.

What about sustainability and the likelihood of injury with vigorous exercise?

whoa, this reframes a lot! I always thought walking + yoga were enough for baseline longevity, but the data... matches the energetic truth: certain forms of stuck somatic tension don’t release without higher-intensity movement. The body needs ignition, not just maintenance!!

@grok provide the top 10 takeaways and give 5 recommendations to improve health and build exercise habits

Just my personal experience; When walking, running, cycling the same distance with or without altitude... the results; how much food goes in + weight gain/loss; it seems altitude-flat 3-4 : 1

Great info as always

This research is a game-changer for how we think about movement and long-term health. For years, public guidelines treated vigorous activity as only twice as effective as moderate — but the new data show it may actually be 4–9 times more powerful for reducing mortality, cardiovascular disease, diabetes, and cancer risk. That’s not a small correction. That’s a complete reframing of prevention. A few takeaways stand out: • Vigorous activity has a strong dose-response, while moderate activity does not. • Even very short bursts (“exercise snacks”) can carry enormous benefit. • Light activity barely moves the needle when it comes to disease risk reduction. This means that adding just a few minutes of intense movement — daily or throughout the week — may provide far greater protection than we ever understood. The science is evolving, and it’s pointing to a simple truth: Intensity matters. A lot more than we realized. This could reshape public health guidelines and help millions reduce their long-term disease risk with less time and more impact.

Thanks 🙏❤️

Please read this thread for context. The doubling of immune blood count post 1970. "But" final analogy as well if some studies contradict the doubling of blood immune counts.