Most adults are advised to get 150 to 300 minutes of moderate-intensity cardio per week, or 75 to 150 minutes of vigorous-intensity cardio, or an equivalent mix of the two. That is the range in the US Physical Activity Guidelines for Americans and in the World Health Organization’s guidance. If you are starting from very little, any amount helps, and you can build toward the range over weeks.
The right number for you depends on your health, your goals and how much you do now. This guide explains what counts as moderate and vigorous, how to add up minutes, how to split a week, and the signs that you are doing too much. It is general information, so talk to a clinician before starting if you have a medical condition, are pregnant, or have symptoms such as chest discomfort or unexplained breathlessness.
What counts as moderate and vigorous
Intensity matters as much as minutes. Two simple ways to gauge it:
- Talk test: At moderate intensity you can talk but not sing. At vigorous intensity you can say only a few words before pausing for breath.
- Perceived effort: On a scale of 0 to 10, moderate effort is commonly described as about 5 to 6, and vigorous as about 7 to 8.
Heart rate is a third option. A common estimate of maximum heart rate is 220 minus your age, with moderate effort often placed at roughly half to about 70 percent of that and vigorous effort at roughly 70 to 85 percent. Treat this as a rough guide only. The formula can be off by 10 beats per minute or more for an individual, and some medicines change heart rate, so the talk test is usually more practical.
| Intensity | Examples | How minutes count |
|---|---|---|
| Moderate | Brisk walking, easy cycling, water aerobics, doubles tennis | 1 minute counts as 1 |
| Vigorous | Running, fast cycling, swimming laps, singles tennis, stair climbing | 1 minute counts as 2 moderate minutes |
So 30 minutes of running roughly equals 60 minutes of brisk walking toward the weekly total. Current US guidance says activity of any length counts toward the total, so a 10-minute walk after lunch is not wasted.
A worked example of counting minutes
Suppose your week includes three 30-minute brisk walks (90 moderate minutes), one 20-minute run (20 vigorous minutes, counted as 40 moderate minutes) and one 45-minute easy bike ride (45 moderate minutes). Your moderate-equivalent total is 90 + 40 + 45 = 175 minutes, inside the 150 to 300 range. The activities are examples, so swap in whatever you enjoy and can do safely.
Effort drifts during a session, so check in more than once. Test your breathing around the 10-minute mark and again near the end. If you could sing comfortably, speed up a little. If you can barely speak, slow down. Heat, hills, poor sleep and recent illness all raise effort for the same pace, so go by how it feels rather than speed alone.
How much cardio for your goal
General health. The 150-minute baseline is the usual target, for example 30 minutes on five days. The guidelines describe health benefits starting well below that, and the biggest relative gain comes from moving from doing nothing to doing something. Going beyond 150 toward 300 minutes brings additional benefit for many adults.
Body weight. The Physical Activity Guidelines note that some people need more than the baseline amount to manage weight, and that what you eat matters a great deal too. Cardio alone is not a reliable way to change body weight, and this site does not promise weight loss. If weight is a health concern, a clinician or registered dietitian can give advice that fits you.
Endurance events. Training for a 5K, 10K or longer event often means several sessions a week, with mostly easy efforts, one longer session and sometimes a harder interval session. Volume is normally increased gradually over many weeks, and a published plan from a recognized running or athletics body is a better guide than a general article.
Support for lifting or sport. A few sessions of 20 to 30 minutes a week is a common way to build conditioning without taking much recovery away from your main training.
Splitting your week
You do not need to do it all at once. Some sample weeks, all of them illustrations rather than prescriptions:
- Beginner (about 90 minutes): Five 15 to 20 minute brisk walks, plus an optional easy ride or walk on the weekend.
- Baseline (about 150 minutes): Five 30-minute sessions of brisk walking, cycling or swimming.
- Balanced with strength work (about 200 minutes): Three 30-minute moderate sessions, one 45-minute easy session and one short interval workout.
- Endurance-focused (several hours): Mostly easy sessions, one long session and one interval session, adjusted to the event.
Most cardio can feel comfortable. Endurance coaches often suggest roughly 80 percent of training time easy and 20 percent hard. That ratio is common practice, not a guideline from the health authorities.
Steady cardio versus intervals
Steady cardio, a continuous even effort, builds an aerobic base and is easy to recover from. Interval training alternates hard and easy efforts, such as 1 minute fast and 2 minutes easy, repeated several times.
Intervals are time-efficient and vigorous minutes count double, but they are tiring and not required for general health. One or two hard sessions a week is plenty for most people, separated by a day or two. If you dislike them, or you have a health condition, steady moderate cardio alone meets the guideline. If you are new to intervals, start with short efforts at a controlled pace rather than an all-out sprint, and stop if you feel dizzy or unwell.
A gentle beginner example: after a 5-minute warm-up, alternate 30 seconds of fast walking with 90 seconds of easy walking, eight times, then cool down for 5 minutes.
Fitting cardio around strength training
Cardio and lifting can coexist. A simple pattern is three strength days and two or three cardio days, with cardio on separate days or after lifting. If you do both in one session, many people put the priority goal first. Very large amounts of hard cardio close to leg day can interfere with leg recovery, while cycling or incline walking blend easily with squats and hinges.
For a lifting plan to pair with this, see the best strength training plan for beginners. If you train at home without equipment, brisk walking plus the routines in best home workouts without equipment cover both halves of the guidelines, since the same guidance advises muscle-strengthening on at least two days a week.
Signs you may be doing too much
Health benefits rise with volume but the returns diminish, and recovery matters. Warning signs include:
- A morning resting heart rate that stays higher than your usual
- Persistent fatigue or heavy legs that do not clear within a day or two
- Declining performance despite more training
- Poor sleep, low mood or loss of interest in training
- Lingering aches in shins, knees or feet
If you notice several, many people cut volume by around a fifth to a third for a week and prioritize sleep. For example, a 200-minute week might drop to about 140 to 160 easy minutes with no intervals. If the signs persist, or come with palpitations, unexplained weight loss or mood changes that worry you, get checked rather than training through it.
When increasing, a common rule of thumb is to add no more than about 10 percent to weekly time or distance at once. It is a cautious habit rather than a research-proven law. Running puts repeated stress on bones, tendons and joints, so if you are new, return to exercise after time off, or carry extra weight, alternate running with walking or use cycling, swimming or an elliptical. Many runners replace shoes after several hundred miles, though the exact point varies.
Starting from low fitness
If you do little now, begin with 10 minutes a day of easy walking and add about 5 minutes a week. An illustration: week 1 is 10 minutes on five days (50 minutes), week 2 is 15 minutes (75), week 3 is 20 minutes (100). If a week feels hard, repeat it before adding more. Reaching 150 minutes might take a couple of months, and that is fine. Short walks after meals or a brisk walk at lunch fit minutes in without a dedicated workout. The guide on starting to work out again after a long break shows a gradual build in more detail.
When to stop and get medical advice
Talk to a clinician before starting vigorous cardio if you have known heart, lung, kidney or metabolic disease such as diabetes, have unexplained symptoms, are pregnant, or have been inactive for a long time. The CDC advises people with a chronic condition to ask a doctor which types and amounts of activity suit them.
Stop exercising and seek medical care for chest pain or pressure, fainting or near-fainting, unusual shortness of breath, a racing or irregular heartbeat, or sudden dizziness. Call emergency services for severe chest pain, especially with sweating, nausea or pain spreading to the arm or jaw. Also get checked for a sudden drop in performance with persistent fatigue, swelling in the legs, or shin or foot pain that is sharp, in one spot and getting worse.
To add up your own week against the guideline, use the weekly activity planner and rough target heart rate helper.
Where this comes from
This article draws on the US Physical Activity Guidelines for Americans from the Department of Health and Human Services, the Centers for Disease Control and Prevention’s adult activity recommendations, and the World Health Organization’s physical activity guidance. Heart-rate zones, the 80/20 split and the 10 percent rule are common practice rather than fixed standards. Guidelines are updated over time, so check the current wording at those sources.
This article is general information, not medical advice. Talk to a qualified clinician about your own situation.