Where These Guidelines Come From
The physical activity recommendations most commonly referenced in the United States come from the Physical Activity Guidelines for Americans, published by the U.S. Department of Health and Human Services (HHS). The guidelines are developed by an advisory committee reviewing thousands of studies, and they are periodically updated — the most recent major edition was released in 2018. The World Health Organization (WHO) publishes parallel global guidelines that largely align with U.S. recommendations.
These are population-level targets based on what the research evidence shows produces measurable health benefits for most people. They are not personalized prescriptions. Individual needs vary based on age, health status, fitness level, and other factors. Always consult a qualified healthcare provider before beginning or significantly changing an exercise program, especially if you have a chronic condition or have been inactive for an extended period.
Core Recommendations by Age Group
Adults (Ages 18–64)
The guidelines recommend that adults get at least 150 to 300 minutes of moderate-intensity aerobic activity per week, or 75 to 150 minutes of vigorous-intensity aerobic activity — or an equivalent combination of both. In addition, muscle-strengthening activities involving all major muscle groups are recommended on two or more days per week.
Moderate-intensity activities include brisk walking, water aerobics, and casual cycling. Vigorous-intensity activities include jogging, swimming laps, or singles tennis. Walking is often underestimated as exercise, but it fully qualifies as a moderate-intensity activity when done at a brisk pace.
Older Adults (Ages 65+)
Older adults follow the same aerobic and muscle-strengthening targets as younger adults, with two important additions: activities that improve balance are recommended to reduce fall risk, and intensity should be adjusted relative to individual fitness level. Chronic conditions may affect what types of activity are appropriate — this is a conversation best had with a physician or physical therapist. For a fuller picture of how activity needs evolve with age, see how exercise needs shift across the adult lifespan.
Children and Adolescents (Ages 6–17)
Children and adolescents need considerably more daily activity than adults. The guidelines recommend 60 minutes or more of moderate-to-vigorous physical activity every day. Within that hour, vigorous-intensity activity should occur at least three days per week, as should muscle-strengthening and bone-strengthening activities (such as jumping or gymnastics).
Moderate-intensity activity
Physical movement that noticeably raises your heart rate and breathing but still allows you to hold a conversation. Examples include brisk walking, recreational cycling, and water aerobics.
Vigorous-intensity activity
Exercise that substantially increases heart rate and breathing, making it difficult to speak more than a few words. Examples include jogging, swimming laps, and aerobic dance.
Muscle-strengthening activity
Exercise that makes muscles work harder than usual, typically through resistance. This includes weightlifting, bodyweight exercises like push-ups, and resistance band training.
Sedentary behavior
Extended periods of physical inactivity — typically prolonged sitting or lying down while awake — that involve very low energy expenditure. Research links excessive sedentary time to negative health outcomes independent of exercise habits.
Bone-strengthening activity
Physical activity that produces a force on bones through impact or resistance, stimulating bone growth and maintenance. Jumping, running, and gymnastics are common examples relevant to children's guidelines.
What Counts — and What Doesn't Fit the Old Myths
One of the most important updates in modern guidelines is the explicit statement that some activity is better than none. Earlier versions implied that exercise had to come in bouts of at least 10 minutes to count. The current HHS guidelines removed that threshold, recognizing that movement accumulated throughout the day — even in short bursts — contributes to overall health.
Sedentary behavior (prolonged sitting) is addressed separately. Reducing the total time spent sitting has independent benefits, even among people who meet weekly activity goals.
If you're returning to movement after a long break, these guidelines can feel daunting. In practice, the research supports building up gradually. Starting a movement practice after years of inactivity is a process, not a single decision. Before diving into structured exercise, it's also worth reviewing a pre-workout readiness checklist to account for your current physical state.
This article is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Speak with a qualified healthcare professional before making changes to your physical activity routine.