Leisure Time Physical Activity and Mortality: A Detailed Pooled Analysis of the Dose-Response Relationship

How much exercise is enough — and is it possible to overdo it? This pooled analysis, drawing on more than 660,000 adults and over a decade of follow-up, is among the most authoritative answers available.

The findings map a clear dose-response curve. Meeting the recommended minimum — about 150 minutes of moderate activity a week — was associated with a 31 percent lower risk of death. The benefit kept climbing with more activity, plateauing at around three to five times the minimum, where mortality risk was roughly 39 percent lower. Crucially, the curve did not turn harmful at the high end: even people exercising at ten times the recommended dose saw no excess mortality, laying to rest the worry that a lot of exercise is dangerous.

The shape of the curve is the practical message. The largest gains come from moving from nothing to something; the returns continue, with diminishing slope, well beyond the guideline minimum; and there is no need to fear doing too much.

We rate the evidence very strong. With an enormous sample, long follow-up, and rigorous methods, it is close to definitive on the dose-response relationship — though, as observational data, it cannot fully exclude that healthier people simply exercise more.