The sentence I have heard more than any other

For thirty years, across South Africa, the Gulf and Asia, one sentence has come up more often than any other when a senior leader and I get onto training. “I just do not have the time.”

It is usually said by someone who has just given forty minutes to a slide deck that did not need them. I rarely argued, because on its own terms it was true. An hour a day, plus the drive, plus the shower, plus the guilt when it slips: most leaders do not have that.

The problem is the premise. Nobody told them the hour was never the minimum.

The excuse was never time. It was the belief that anything short of an hour does not count.

1. What 25,241 non-exercisers were already doing

In 2022, a team led by Emmanuel Stamatakis at the University of Sydney went looking for exercise in the lives of people who do not exercise. They took 25,241 adults from the UK Biobank who reported no leisure-time exercise at all. Average age, 62. Each wore a research-grade wrist device for a week, and the team followed them for around seven years.

They were not looking for workouts. They were looking for short bursts of hard effort buried inside ordinary life: stairs taken quickly, heavy shopping carried from the car, a near-jog for a bus. The researchers call it vigorous intermittent lifestyle physical activity. I will call it a burst.

The bursts were short. 92 in every 100 lasted a minute or less. The typical person managed about three a day, adding up to around four and a half minutes.

Nobody in that group would have called themselves active. Every one of them would have ticked “none” on a gym questionnaire.

Their average age matters. If you are 45 and reading this between meetings, this study is a preview. The capacity you will want at sixty, to carry a grandchild up the stairs or to keep running the business on your own terms, is being decided now, in minutes you currently spend waiting for a lift.

2. What the bursts were worth

Here is the headline finding, out of research language.

The same pattern ran through every outcome they measured.

What they did each day	Deaths during the study
No bursts at all	10, the comparison
Around 3.4 minutes, the smallest dose with a clear benefit	Between 7 and 8
About 4.4 minutes, the typical amount	About 7
Three short bursts, counted by number rather than minutes	About 6
Three short bursts, heart and circulation deaths only	About 5

People who did no bursts are the anchor: 10 in every row.

Counted by minutes or by number of bursts, the figures differ a little. Both point the same way, and the benefit kept climbing as the bursts added up. Hard efforts push the heart and lungs close to their ceiling, and that is the signal the body uses to hold on to fitness.

Then the detail every operator reading this should sit up for. The team ran the same analysis on 62,344 people who did exercise, looking at their vigorous activity. The curve was almost identical. In this data, a hard minute on the office stairs and a hard minute in a class looked much the same.

The fitness industry built its model on selling the hour. The people with the most to gain were never going to buy one.

For forty years, this industry has sold one product in different wrappers: the hour. The membership, the class, the PT session. It fills a timetable and it justifies a price. It also tells the people who do nothing, the group this study says has the most to gain, that nothing short of sixty minutes counts. I have spent three decades on gym floors and I have sold that hour myself. It was never the minimum. It was the product.

3. Where the evidence stops

I want you to use this, so here is what it cannot tell you.

It shows a pattern, not a cause. The team followed people rather than assigning them. People who were already healthier may simply have been the ones taking the stairs two at a time. The researchers adjusted for a long list of factors, and they state plainly that the design cannot prove causation.

The sample is not everyone. Around 5 in every 100 people invited to the UK Biobank took part, and volunteers tend to be healthier and wealthier than average. One week on a wrist is a snapshot, not a lifetime.

Women and men did not respond the same. In 2024 the same team looked at heart attacks, heart failure and other major heart events in 22,368 non-exercisers. For every 10 major heart events among women who did no bursts, there were roughly 5.5 among women averaging around 3.4 minutes a day. In men the link was far weaker: a little over 8 in 10, and that took more than five minutes a day.

No trial has yet assigned thousands of people to bursts and waited a decade to count deaths. It may never be run.

So I went looking for a trial with an outcome you can feel on a Monday. At McMaster University in 2019, Jenkins and colleagues took 24 sedentary young adults. Half climbed a 60 step stairwell as hard as they could, three times a day, three days a week, for six weeks. Half did nothing. The climbers’ fitness rose by around 5 in every 100, and they finished fitter than the group who did nothing. The authors called the gain modest. It was. It was also earned in a stairwell, with no kit, between other things.

A real pattern, in large numbers, with a clear ceiling. Enough to act on. Not enough to promise anyone an extra decade.

4. The Four Minute Rule

Four one minute bursts a day, hard enough that you would rather not hold a conversation. Three stages.

Before you start. If you have a heart condition, or have been told to avoid hard effort, talk to your doctor first.

The bottom line

The best news in this edition goes to the reader who does least. The study found its gains in people doing nothing at all, which describes more senior people than would admit it in public.

The evidence has a ceiling, and I have shown you where it sits. Under that ceiling is still a consistent pattern, across tens of thousands of people, for a dose that fits inside a day you already have.

Your one action before Friday. Tonight, write your four moments on one line in your phone. Tomorrow, do all four, hard, and tick each one off. If you cannot find four, count how many lifts you waited for instead.