It is 3:07 p.m. as I start writing this. I want to get to the gym by 4:30. My theory is that writing it under mild time pressure created by my own need to exercise was appropriate.
Reason: We’ll be talking about a study that shows why no matter how busy you are, even small habits of vigorous exercise can pay enormous dividends for your health.
A new study published in the European Heart Journal — in case you let your subscription lapse, I’ll summarize — analyzed data from nearly 96,000 people who wore wrist-based accelerometers for a week.
The researchers tracked not just how much people moved, but how intensely. They then followed participants for seven years, measuring their risk of developing eight serious conditions:
major cardiovascular disease
irregular heartbeat
type 2 diabetes
immune-mediated inflammatory diseases
liver disease
chronic respiratory disease
chronic kidney disease
dementia
Findings: Compared with people who did no vigorous activity at all, those with the highest levels of intense movement had a 63% lower risk of developing dementia, a 60% lower risk of type 2 diabetes, and a 46% lower risk of dying.
The key phrase there is “vigorous activity,” meaning movement that’s intense enough to make you breathless.
This is where the study gets genuinely useful, especially for busy people who have a hard time fitting everything into a 24-hour day.
“Adding short bursts of activity that make you slightly breathless into daily life, like taking the stairs quickly, walking fast between errands or playing actively with children, can make a real difference,” said Professor Minxue Shen of the Xiangya School of Public Health at Central South University, who led the research.
Even 15 to 20 minutes per week of this kind of effort was linked to meaningful health benefits — emphasis on per week, not day. The researchers also found that intensity mattered differently depending on the disease.
For inflammatory conditions like arthritis and psoriasis, intensity was the key factor. For diabetes and chronic liver disease, both how long and how hard people moved made a difference.
The consistent thread across all eight conditions was that vigorous activity outperformed moderate activity, minute for minute.
As for why it’s helpful, Professor Shen’s explanation is basically that during vigorous activity, your heart pumps more efficiently, blood vessels become more flexible, and your body improves its ability to use oxygen.
Intense movement also appears to reduce inflammation, which may explain the strong associations with arthritis and psoriasis specifically, and may stimulate brain chemicals that support cognitive health, which could account for the dementia finding.
This is observational research drawn from the UK Biobank, so a caveat: it can’t prove that vigorous activity directly causes these reductions in disease risk.
People who move more intensely may share other lifestyle traits — better sleep, less stress, and different diets — that also contribute. The researchers controlled for many of these factors, but residual confounding is always possible in studies like this.
Still, current exercise guidelines focus on total time — 150 minutes of moderate activity per week or 75 minutes of vigorous activity. This study suggests that the composition of that time matters, not just the volume.
If two people exercise the same total number of minutes, the one who occasionally pushes to the point of breathlessness appears to come out ahead, across multiple disease categories, by a wide margin.
Anyway — update in real time — I’m back from the gym and on my fourth pass, and there’s one thing worth clarifying. The 15-to-20-minutes-per-week figure refers to the minimum threshold where researchers began seeing meaningful benefits, not a ceiling or a target.
More vigorous activity continued to show stronger associations with lower disease risk throughout the study. So, 15-20 minutes is the floor, not the finish line.
The European Heart Journal has now given me three separate reasons to feel okay about my health and exercise habits — sleep, coffee, and now exercise.
I’m choosing to believe it’s the former.
Other things worth knowing …
Daily Mail: President Donald Trump, 80, is fixated on negative coverage of his swollen ‘cankles’ as his staff whisper about his ‘old’ age, a new book reveals. A White House spokesperson pointed a finger at Biden in response: ‘President Trump is the sharpest and most accessible President in American history who is working nonstop to solve problems and deliver on his promises.’
CNN: Alan Greenspan, the jazz-playing Federal Reserve chairman who was celebrated as a "Maestro" for engineering a decade of prosperity but later shared blame for the 2008 financial crisis, died this week at 100. He served under four presidents across nearly 19 years at the Fed.
AP via NBC Dallas: Even as it battled the deadliest drug epidemic in American history, the DEA permitted hundreds of thousands of fentanyl pills to hit the streets of New Mexico between 2023 and 2025, according to sources. "We poisoned our community to make cases," said DEA Special Agent David Howell, who filed a whistleblower complaint. One case he flagged: a 15-month-old toddler who died after ingesting burned fentanyl residue.
CBS News Miami: Companies hired to run Florida's "Alligator Alcatraz" were notified Monday to begin full demobilization of the facility, quietly ending a $1.2 billion experiment once hailed by DeSantis and Trump as a model for other states. Florida is still waiting on most of the $608 million in federal reimbursements it was promised, having received only $58 million so far.
NYT: The United States plans to provide welcome gifts to white South Africans entering the United States as refugees, including an Android tablet, a report commissioned by Mr. Trump that downplays the role of slavery in history of the U.S., and a children’s book accusing South Africa’s government of “favoring the Black population.” Trump is welcoming the minority in South Africa, even as the U.S. bans refugees fleeing from war and persecution everywhere else in the world.
U.S. News: The U.S. announced $17.5 billion in federal loans for 10 new large nuclear reactors across the U.S. — the largest single investment in American nuclear power in decades.
ScienceDaily: Scientists discovered that kombucha's flavor, chemistry, and antioxidant activity vary dramatically depending on the tea used to make it — green and oolong tea versions emerged as the most biologically active. The finding matters because most commercially sold kombucha is made from black tea, which the study found to be the least potent.
Thanks for reading. I wrote about some of this at Inc.com. See you in the comments.