How Much Exercise Do You Actually Need?
The US and WHO physical-activity guidelines in plain English: minutes of cardio, days of strength training, and why some activity beats none.
The short answer
Adults should aim for 150–300 minutes of moderate cardio or 75–150 minutes of vigorous cardio each week (or a mix), plus muscle-strengthening activities on two or more days.
Any amount helps: the least active people gain the most from small increases.
What the guidelines say
The Physical Activity Guidelines for Americans (2nd edition) recommend 150–300 minutes a week of moderate-intensity or 75–150 minutes of vigorous-intensity aerobic activity, plus muscle-strengthening activity on two or more days. They emphasise that moving more and sitting less benefits nearly everyone.
The World Health Organization’s 2020 guidelines reaffirm that some physical activity is better than none, more is better for health, and that both aerobic and muscle-strengthening activity matter; they also recommend reducing sedentary time.
For people who lift
- Lifting covers the muscle-strengthening guideline.
- Add the cardio separately — walking, cycling, rowing or a treadmill all count.
- Moderate intensity means you can talk but not sing; vigorous means only a few words at a time.
Evidence: [3]
Common mistakes
- Assuming lifting alone covers cardiovascular fitness.
- Waiting for a perfect plan instead of starting with 10-minute walks.
Bottom line
Lift at least twice a week and accumulate 150+ minutes of moderate cardio; every extra bit of activity counts.
References
- [1] Piercy KL, Troiano RP, Ballard RM, et al. The Physical Activity Guidelines for Americans. JAMA. 2018;320(19):2020–2028. National guideline (US Department of Health and Human Services) doi.org/10.1001/jama.2018.14854
- [2] Bull FC, Al-Ansari SS, Biddle S, et al. World Health Organization 2020 guidelines on physical activity and sedentary behaviour. British Journal of Sports Medicine. 2020;54(24):1451–1462. International guideline (WHO) doi.org/10.1136/bjsports-2020-102955
- [3] Garber CE, Blissmer B, Deschenes MR, et al. Quantity and quality of exercise for developing and maintaining cardiorespiratory, musculoskeletal, and neuromotor fitness in apparently healthy adults: guidance for prescribing exercise. Medicine & Science in Sports & Exercise. 2011;43(7):1334–1359. Position stand (ACSM) doi.org/10.1249/MSS.0b013e318213fefb
This guide summarises published research for healthy adults. It is general information, not medical advice — if you have a health condition, injury or take medication, talk to a qualified professional before changing your training or supplements.
