Adults need at least 150 minutes of moderate-intensity aerobic activity per week, plus two days of muscle-strengthening exercises. That’s the current standard from the Physical Activity Guidelines for Americans, and it breaks down to roughly 30 minutes of movement five days a week. If you prefer higher-intensity workouts, you can cut that aerobic time in half to 75 minutes per week, or mix moderate and vigorous activity to hit the equivalent.
The Core Weekly Targets
The guidelines give you three paths to the same goal:
- Option 1: 150 minutes of moderate-intensity aerobic activity, plus 2 days of muscle strengthening
- Option 2: 75 minutes of vigorous-intensity aerobic activity, plus 2 days of muscle strengthening
- Option 3: An equivalent combination of moderate and vigorous activity, plus 2 days of muscle strengthening
You don’t need to do all 150 minutes at once or even in long sessions. Spreading activity throughout the week in whatever chunks fit your schedule counts. A 10-minute brisk walk after each meal, for instance, adds up to over 200 minutes across a week.
What Counts as Moderate vs. Vigorous
Moderate intensity means your heart rate sits at about 50% to 70% of your maximum. At this level, you’re breathing harder than normal but can still carry on a conversation. Brisk walking, casual biking, swimming at an easy pace, and mowing the lawn all qualify.
Vigorous intensity pushes your heart rate to roughly 70% to 85% of your maximum. You’ll be breathing hard enough that talking in full sentences becomes difficult. Running, swimming laps, heavy yard work, and aerobic dance fall into this category. Because vigorous exercise demands more effort per minute, you get credit for double the time: one minute of vigorous activity equals two minutes of moderate activity.
A simple way to estimate your maximum heart rate is to subtract your age from 220. So a 40-year-old has a rough max of 180 beats per minute, and moderate intensity for them would be 90 to 126 beats per minute.
Why Strength Training Gets Its Own Requirement
The two days of muscle-strengthening activity aren’t optional add-ons. They’re a separate pillar of the guidelines because aerobic exercise alone doesn’t preserve muscle mass, bone density, or joint stability as you age. Strength training means any activity that works your major muscle groups: legs, hips, back, chest, abdomen, shoulders, and arms. That includes free weights, resistance bands, bodyweight exercises like push-ups and squats, or even heavy gardening like digging and shoveling.
These sessions don’t need to be long. Working each major muscle group with enough resistance to make the last few repetitions challenging is the key. Two non-consecutive days per week is the minimum target.
How Much Activity Actually Moves the Needle on Health
Meeting the 150-minute guideline is associated with a 30% to 40% lower risk of dying from any cause compared to being consistently inactive. A large meta-analysis published in the British Journal of Sports Medicine found that people who stayed active over time saw the greatest benefits, with risk reductions reaching around 40% at the standard recommended level.
The relationship between activity and health isn’t perfectly linear, though. The biggest jump in benefit comes from going from doing nothing to doing something. The most substantial risk reduction occurs at roughly the guideline level, and while doing more than the recommended amount still helps, the additional gains taper off. This means if you’re currently sedentary, even half the recommended amount delivers meaningful protection.
People who increased their activity levels over time, even after years of being inactive, still saw a 20% to 25% lower mortality risk. Starting late is far better than not starting.
Additional Guidelines for Adults Over 65
Older adults follow the same 150-minute aerobic and two-day strength training framework, with one important addition: balance training. The CDC specifically recommends that adults 65 and older include activities that improve balance, such as walking heel-to-toe, standing from a seated position, or tai chi. Falls are a leading cause of injury in this age group, and balance work directly reduces that risk.
These balance exercises can be woven into your existing routine rather than treated as a separate workout. Standing on one foot while brushing your teeth, practicing heel-to-toe walking down a hallway, or doing sit-to-stand repetitions from a chair all count.
Practical Ways to Reach 150 Minutes
The number sounds like a lot until you break it down. Five 30-minute walks per week gets you there. So does three 50-minute sessions, or a mix of shorter walks during the week with a longer weekend hike. If you prefer vigorous exercise, three 25-minute runs cover your aerobic needs entirely.
For people with packed schedules, high-intensity interval training offers a time-efficient option. Short bursts of all-out effort followed by brief recovery periods can deliver vigorous-intensity benefits in compressed timeframes. Some structured formats pack a full series into as little as four minutes, though most practical sessions run 15 to 25 minutes.
The overarching principle from the guidelines is simple: move more, sit less. Any amount of moderate or vigorous activity provides some health benefit, even if you can’t hit the full 150 minutes right away. The worst weekly total is zero.