"You need 10,000 steps a day" is one of those numbers everyone has heard and almost no one remembers the source of. It turns out that number came from a 1960s Japanese pedometer marketing campaign, not a research finding. A real study, published in 2025, gives a much more useful — and much more forgiving — answer.

What researchers did

A team at Brigham and Women's Hospital tracked step counts for 13,547 older women (average age 72) using wearable activity trackers for one week, then followed their health outcomes for close to a decade afterward. None of the women had heart disease or cancer when the study began.

What they found

Women who reached about 4,000 steps on just one or two days of that tracked week had a meaningfully lower risk of dying during the follow-up period than women who never reached 4,000 steps on any day. Reaching that count on three or more days a week was linked to an even lower risk — up to 40% lower.

The benefit leveled off somewhere between 5,000 and 7,000 steps a day — going well beyond that did not add much more benefit in this study. And here is the detail that matters most for anyone who has ever felt discouraged by a fitness tracker: it was the total amount of walking that mattered, not a perfect daily streak.

What this means for you

If some days you manage a walk and some days you genuinely do not, this study suggests that is not a failure — the walking you do still counts, and you do not need a flawless daily habit to see a benefit.

This is exactly the spirit behind Movement That Fits Wherever You Are and Small Moves That Add Up: a short walk today is worth doing on its own, whether or not you walked yesterday.

What we won't claim

One study, even a well-run one, is not the final word, and it cannot promise any individual person a specific outcome. What it does offer is real evidence that a forgiving, "some is better than none" approach to walking has genuine support behind it — not just as a consolation, but as the actual finding.