Thirty minutes a day: what the research says about how much movement counts
Suppose you walk briskly for 30 minutes on five days a week. That adds up to 150 minutes, which is the minimum for moderate activity in US guidelines. What does that buy?
Researchers pooled six studies from the United States and Europe, covering 661,137 people with a median age of 62. There were 116,686 deaths. They compared people by how much they moved in leisure time.
Lower risk of death compared with no leisure-time activity (pooled analysis, 2015)
| Minutes a week of moderate activity | Lower risk of death |
|---|---|
| Under 150 | 20% |
| 150 to 300 | 31% |
| 300 to 450 | 37% |
| 450 to 750 | 39% |
| 1,500 or more | 31% |
Minutes are for moderate activity such as brisk walking. Vigorous activity counts for about double the minutes.
The largest gain per minute comes at the start. Under 150 minutes a week went with a 20% lower risk. Going from 150 to 450 minutes added 8 more points.
More minutes did not raise the risk of death. People who did ten or more times the minimum still had a 31% lower risk than people who did none, with no sign of harm.
A second pooled analysis counted years of life. It covered 654,827 adults aged 21 to 90 and measured years gained after age 40.
Years of life gained after age 40, compared with no leisure-time activity (pooled analysis, 2012)
| Brisk walking a week | Years gained |
|---|---|
| Up to 75 minutes | 1.8 |
| 150 minutes | 3.4 |
| 300 minutes | 4.2 |
| 450 minutes or more | 4.5 |
The authors wrote that this holds if the link is causal.
The condition is that the link is causal, which these studies cannot show. They relied on people reporting their own activity. People who move more may also differ in other ways, such as being healthier at the start.
Two other articles in this series connect here. One of the five habits in the Harvard study is 30 minutes a day. In the walkability study, moving to a more walkable city added about 11 minutes of walking a day.
Eleven minutes a day is about 77 minutes a week. That is close to the first row of the second table.
What do you do now, and what would you add? Tell us in the comments. Someone may need your idea.
Sources we read
Arem and others, Leisure time physical activity and mortality: a detailed pooled analysis of the dose-response relationship, JAMA Internal Medicine, 2015. https://pubmed.ncbi.nlm.nih.gov/25844730/
American Journal of Medicine, Exercise and health: dose and response, considering both ends of the curve (reports the 37% and 39% bands). https://www.amjmed.com/article/S0002-9343(15)00455-6/fulltext
Moore and others, Leisure time physical activity of moderate to vigorous intensity and mortality: a large pooled cohort analysis, PLOS Medicine, 2012. https://journals.plos.org/plosmedicine/article?id=10.1371%2Fjournal.pmed.1001335
National Institutes of Health summary of the 2012 study (3.4 and 4.2 years). https://www.sciencedaily.com/releases/2012/11/121106191907.htm
Li and others, Impact of healthy lifestyle factors on life expectancies in the US population, Circulation, 2018. https://www.ahajournals.org/doi/10.1161/CIRCULATIONAHA.117.032047
Althoff and others, Countrywide natural experiment links built environment to physical activity, Nature, 2025. https://www.nature.com/articles/s41586-025-09321-3
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