For years, exercise advice came with fine print: start young, do it for at least 10 minutes at a time, spread it through the week. Newer studies, many using wearable activity trackers, have loosened almost all of those rules.
- ~1/3
lower risk of dying early in people who only became active in middle age.
- 3 × 1 min
bursts of huffing and puffing a day were linked with about 40% lower risk.
- 1–2
sessions a week can work as well as spreading the same amount out.
Starting late still counts
Link to this section: Starting late still counts
A study of more than 300,000 US adults asked people how active they had been at different ages. Those who were inactive as teenagers and young adults but became active in their 40s and 50s had about a third lower risk of dying during follow-up than people who stayed inactive. That was about the same benefit as people who had been active all their lives.
One-minute bursts
Link to this section: One-minute bursts
A 2022 study gave activity trackers to more than 25,000 UK adults, average age 62, who said they did no formal exercise. Some of them still had short bursts of vigorous everyday movement: climbing stairs briskly, power-walking to catch a bus, playing energetically with grandchildren. Researchers call this “vigorous intermittent lifestyle physical activity.”
Three 1-minute bursts a day, compared with none
How much lower the risk of dying was over about 7 years
Death from heart and blood vessel disease
up to −49%
Death from any cause
up to −40%
Death from cancer
up to −40%
In 2020, the World Health Organization dropped its old rule that activity only counts in 10-minute chunks. These findings help explain why.
Weekend warriors
Link to this section: Weekend warriors
What if you can only fit exercise into one or two days? In a study of about 350,000 US adults, people who packed the recommended weekly amount into one or two sessions had similar lower risk of dying as people who spread the same amount across the week. A 2025 study of more than 50,000 adults with diabetes found the same pattern. What seems to matter most is the total, not the schedule.
Putting it together
Link to this section: Putting it together
- Whatever your age, starting now counts.
- Turn everyday moments into short bursts: take the stairs quickly, walk briskly between errands.
- If weekdays are packed, a longer walk or session on the weekend is worthwhile.
- Build up gradually, and check with your clinician first if you have heart symptoms or a heart condition.
Try it yourself. Estimate your fitness with the one-mile walk test
This article is for general education and is not medical advice for any individual.
References
- Saint-Maurice PF, et al. Association of leisure-time physical activity across the adult life course with all-cause and cause-specific mortality. JAMA Netw Open. 2019;2(3):e190355.
- Stamatakis E, et al. Association of wearable device-measured vigorous intermittent lifestyle physical activity with mortality. Nat Med. 2022;28(12):2521–2529.
- dos Santos M, et al. Association of the “weekend warrior” and other leisure-time physical activity patterns with all-cause and cause-specific mortality. JAMA Intern Med. 2022;182(8):840–848.
- Wu Z, et al. Association of weekend warrior and other physical activity patterns with mortality among adults with diabetes: a cohort study. Ann Intern Med. 2025.
- Bull FC, et al. World Health Organization 2020 guidelines on physical activity and sedentary behaviour. Br J Sports Med. 2020;54(24):1451–1462.
Cite or share this article
Bernard Aoun, MD. Never too late, never too short: the new science of staying active. Tortoise Time. Updated September 2026. https://www.tortoisetime.com/learn/never-too-late-never-too-short
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Keep the testing method, population and limitations with any quoted finding. A page update is not evidence of an independent medical review.