What Is the Minimum Effective Dose of Exercise for Health and Longevity?

The short answer

Just 11 minutes (75 minutes per week) of moderate-intensity aerobic exercise is associated with a 17% reduction in all-cause mortality and a 23% reduction in cardiovascular disease risk. The dose-response curve is steep at low volumes: the greatest mortality benefit per unit of exercise is gained in the transition from doing nothing to doing a small amount.

What the evidence actually shows

A 2023 meta-analysis by Ekelund et al. in the British Journal of Sports Medicine, pooling data from nine studies and over 44,000 adults, found that 75 minutes per week of moderate-to-vigorous physical activity was associated with a 17% lower all-cause mortality risk. A landmark 2015 study by Arem et al. in JAMA Internal Medicine, following 661,137 adults for a median of 14 years, found that those meeting the minimum guideline (150 minutes per week) had a 31% lower all-cause mortality risk compared to inactive individuals, and those doing 3–5 times the minimum had a 39% lower risk. Critically, even those doing half the minimum (75 minutes per week) had a 20% lower mortality risk. Moore et al. (2012) found that meeting the minimum guideline was associated with 3.4 additional years of life expectancy.

"Even half the recommended minimum of physical activity was associated with a 20% lower risk of all-cause mortality."

— Arem et al., JAMA Internal Medicine 2015

What the major health authorities say

The NIH National Institute on Aging recommends at least 150 minutes of moderate-intensity aerobic activity per week for older adults, plus muscle-strengthening activities on two or more days. The NIA emphasises that any amount of physical activity is better than none, and that even short bouts of activity throughout the day contribute meaningfully. The key message is to start where you are and gradually increase.

Practical implications

If you are currently sedentary, the single most impactful change you can make is adding 10–15 minutes of brisk walking per day. This alone places you in a substantially lower mortality risk category. The official 150-minute weekly target is worth pursuing, but the evidence shows you do not need to achieve it immediately to benefit. A practical starting point is three 25-minute walks per week, progressing to five 30-minute walks over 8–12 weeks.

Where reasonable people still disagree

• Whether vigorous exercise (75 min/week) is truly equivalent to moderate exercise (150 min/week) for all health outcomes, or whether the equivalence applies mainly to cardiovascular mortality.
• The relative importance of aerobic versus resistance training at low exercise volumes for overall longevity.
• Whether the benefits of minimal exercise are fully independent of confounders such as overall health status and socioeconomic factors.