Most adults need 150 to 300 minutes of moderate-intensity aerobic activity per week, or 75 to 150 minutes of vigorous-intensity activity, plus two days of strength training. That’s the baseline recommended by the World Health Organization and echoed by major health agencies worldwide. But the real answer depends on your age, your goals, and how you prefer to move.
The Weekly Minimum for Adults
The floor is 150 minutes of moderate-intensity aerobic activity per week. That’s the equivalent of a 30-minute brisk walk five days a week. If you prefer higher-intensity exercise like running, cycling hard, or swimming laps, 75 minutes per week hits the same threshold. You can also mix the two: a couple of jogs plus a few walks gets you there.
On top of cardio, adults need at least two days per week of muscle-strengthening activity that works all major muscle groups: legs, hips, back, abdomen, chest, shoulders, and arms. That could be weight training, bodyweight exercises, heavy gardening, or resistance band work. The two days don’t need to be consecutive, but they do need to cover your whole body rather than isolating one area.
The Sweet Spot for Longevity
Meeting the minimum is good. Doubling it is better. A large prospective study of U.S. adults published in Circulation found that the greatest reduction in death risk came from about 300 to 600 minutes per week of moderate activity, or 150 to 300 minutes of vigorous activity. Beyond those ranges, the mortality benefits plateaued. You weren’t harmed by doing more, but you didn’t gain much additional protection either.
In practical terms, that sweet spot translates to roughly 45 to 90 minutes of moderate activity per day, or 20 to 45 minutes of vigorous activity. People who hit the recommended amount of moderate exercise had a 22% to 25% lower risk of dying from cardiovascular disease compared to inactive people. Those meeting vigorous activity targets saw a 31% lower risk.
You Don’t Have to Exercise Every Day
One of the most useful findings in recent exercise science is that “weekend warriors,” people who pack all their weekly exercise into one or two sessions, get nearly the same benefits as those who spread activity across the week. A 2025 meta-analysis in BMC Public Health found that weekend warriors had a 23% lower risk of dying from any cause compared to inactive people, while regularly active people had a 30% lower risk. The difference between the two groups was not statistically significant.
The pattern held across cardiovascular disease, cancer, metabolic conditions, and even brain health, where the weekend warrior group actually showed a slightly greater risk reduction. This matters if your schedule only allows for a long Saturday hike and a Sunday gym session. Concentrated activity is far better than no activity, and the health returns are comparable to daily exercise.
Guidelines for Children and Teens
Kids need more movement than adults. Children and adolescents aged 6 to 17 should get 60 minutes or more of moderate-to-vigorous physical activity every day. Most of that hour should be aerobic, things like running, biking, or playing sports. At least three days per week should include vigorous-intensity activity, and another three days should include muscle-strengthening activities like climbing or push-ups. Three days per week should also include bone-strengthening activity such as jumping, running, or hopscotch, which helps build bone density during the years it matters most.
Adjustments During Pregnancy
Pregnant and postpartum women benefit from at least 150 minutes of moderate-intensity aerobic activity per week. That might look like 30 minutes of brisk walking five days a week. Water aerobics, stationary cycling, and certain forms of yoga also count. After the first trimester, it’s best to avoid exercises that require lying flat on your back. The same 150-minute target applies during the postpartum period.
Extra Needs for Older Adults
Adults 65 and older follow the same aerobic and strength training recommendations as younger adults, with one addition: balance training. Falls are a leading cause of injury in older adults, and regular balance exercises, such as standing on one foot, heel-to-toe walking, or tai chi, reduce that risk. Strengthening the back, abdomen, and legs also improves balance, so strength training and fall prevention overlap. The CDC recommends older adults aim for all three types of activity each week: aerobic, muscle-strengthening, and balance work.
Moderate vs. Vigorous Intensity
The distinction between moderate and vigorous activity comes down to effort. During moderate-intensity exercise, you can talk but not sing. Your heart rate rises, you breathe harder, but you’re not gasping. Brisk walking, casual cycling, mowing the lawn, and recreational swimming all qualify.
Vigorous-intensity exercise pushes you harder. You can only say a few words before needing to catch your breath. Running, fast cycling, lap swimming, singles tennis, and high-intensity interval training all fall in this category. Because vigorous activity is roughly twice as demanding, the recommended minutes are half those for moderate activity. One minute of vigorous exercise counts as two minutes of moderate exercise when you’re mixing both types.
How to Think About “Enough”
The single most important threshold is the jump from nothing to something. Moving from zero weekly exercise to even 75 minutes of moderate activity produces dramatic health improvements. Every additional minute brings diminishing but real returns up to about 300 minutes of moderate activity per week, after which the curve flattens considerably.
If you’re currently inactive, starting with 10- or 15-minute walks and building from there is a proven approach. If you’re already hitting 150 minutes, adding a second strength session or pushing toward 300 minutes of moderate activity will give you measurably more protection against heart disease, metabolic conditions, and early death. And if your schedule is chaotic, know that cramming your exercise into the weekend works nearly as well as spreading it out. The volume matters more than the pattern.