US guidelines advise adults to get 150 to 300 minutes of moderate aerobic activity a week, or 75 to 150 minutes of vigorous activity, plus muscle-strengthening work on two or more days. Brisk walking for 30 minutes on five days meets the lower target.
You do not have to reach that number to benefit. In large studies, the biggest step down in risk comes from moving out of the "no activity" group, and smaller amounts than the guideline are still linked to longer life.
Key takeaways
- The standard target is at least 150 minutes of moderate or 75 minutes of vigorous activity each week, with strength work twice a week.
- Going from nothing to something brings the largest gain, so short sessions are worth doing.
- More activity adds benefit up to a point, and large studies have not found harm at very high amounts.
- Most of this evidence comes from observational studies, which show a link without proving cause.
- Exercise lowers risk but does not show whether plaque is already present.
What the guidelines recommend
The Physical Activity Guidelines for Americans set the amounts most clinicians quote. Adults should do at least 150 to 300 minutes a week of moderate-intensity aerobic activity, or 75 to 150 minutes of vigorous-intensity activity, or an equal mix of the two. They should also do muscle-strengthening activities on two or more days a week.1
The guidelines add two points that often get lost. Moving more and sitting less helps nearly everyone, and the people who are least active gain the most from even a modest increase. Our guide to sitting and heart risk covers sedentary time on its own.
Moderate intensity means your breathing and heart rate are up but you can still hold a conversation. Brisk walking, easy cycling and doubles tennis usually fit. Vigorous means you can say only a few words before you need a breath, as with running, fast cycling or swimming laps.
Any amount helps: what the dose-response studies show
A pooled analysis of 661,137 adults in the United States and Europe, followed for a median of 14.2 years, compared death rates across activity levels. People who did some leisure activity but less than the recommended minimum had a 20% lower risk of death than people who did none.2 The pattern was similar for deaths from cardiovascular disease.
| Weekly activity | Risk of death compared with no activity |
|---|---|
| Some, but below the guideline minimum | 20% lower |
| 1 to 2 times the minimum | 31% lower |
| 2 to 3 times the minimum | 37% lower |
| 3 to 5 times the minimum | 39% lower |
Two things stand out. Most of the benefit arrives by the time you reach the guideline, and doing three to five times as much adds only a little. The same analysis found no evidence of harm among people doing ten or more times the minimum.2
A study of 416,175 adults in Taiwan looked at the low end. People who exercised about 15 minutes a day had a 14% lower risk of death from any cause than inactive people.3 That is well below the guideline amount.
How much to trust these numbers
These are observational studies. People reported their own activity, and people who exercise also tend to smoke less, eat better and have fewer illnesses to begin with. Researchers adjust for those differences, but they cannot remove them completely.
So the percentages above describe links seen in large groups. They are not a promise of what exercise will do for one person. What makes the case convincing is the consistency: the same pattern appears across countries, age groups and ways of measuring activity, and exercise improves blood pressure, blood sugar and weight in ways that fit the findings.
Strength training counts too
Muscle-strengthening activity includes weights, resistance bands, body-weight exercises and heavy yard work. It has been studied less than aerobic exercise, but the evidence points the same way.
A meta-analysis of 16 cohort studies found that muscle-strengthening activities were associated with a 10% to 17% lower risk of dying from any cause and of developing cardiovascular disease, cancer or diabetes.4 The lowest risk of death and cardiovascular disease was seen at about 30 to 60 minutes a week. Beyond that amount the picture was unclear, so more is not necessarily better here.
People who combined strength work with aerobic activity had lower risk than people who did neither, which supports the guideline advice to do both.
Steps, short bouts and everyday movement
Formal workouts are not the only way to be active. Walking counts, and step counts are an easy way to track it.
A meta-analysis of eight studies with 20,152 adults used devices to count steps. Among adults aged 60 and older, those in the highest quarter for daily steps had about half the risk of cardiovascular disease of those in the lowest quarter.5 Among younger adults the same analysis did not find a clear link, possibly because heart events are uncommon at younger ages over a follow-up of about six years.
The 10,000-step figure is a popular goal, not a medical threshold. What these studies support is simpler: more steps than you take now is a reasonable aim.
Before you increase your activity
For most adults, starting with walking and building up slowly is safe. Talk with your clinician first if you have known heart disease, diabetes or kidney disease, or if you get chest discomfort, unusual shortness of breath, lightheadedness or palpitations with effort.
Stop and call 911 if you have chest pain or pressure that does not settle quickly with rest.
Fitness also does not rule out artery disease. Active people can have plaque, and long-term endurance athletes have their own pattern on heart scans, described in our guide to endurance athletes and calcium scores.
Where to go from here
Exercise changes your risk over time. Testing shows where you stand now. If you want to understand the numbers behind your risk, start with the PREVENT risk calculator guide, then read how a coronary calcium score looks for calcified plaque directly.
Cardio Res-Q, the heart-disease prevention program at YoungerMeMD, includes exercise and recovery in its lifestyle and risk evaluation. The screener on the program page asks three quick questions to help you see whether a closer look fits your situation.
Are You a Candidate for Cardio Res-Q?
Three quick questions about the risk factors we screen for. Your answers stay between you and the clinic.
Frequently asked questions
Is walking enough exercise for heart health?
Brisk walking counts as moderate-intensity activity, and 150 minutes a week of it meets the aerobic guideline. Adding muscle-strengthening work on two days covers the rest of the recommendation.
Can you exercise too much for your heart?
The large pooled study described above found no excess risk of death in people doing ten or more times the minimum recommended amount. That is group data. If you train at high volumes and have symptoms or a strong family history, talk with your clinician.
Do I have to do it all at once?
No. The guidelines count total weekly minutes, and they stress that moving more and sitting less helps nearly everyone. Several short walks across the day add up.
If I exercise regularly, do I still need my cholesterol checked?
Yes. Exercise lowers risk but does not cancel inherited factors such as high LDL cholesterol or lipoprotein(a). Fit people can still have plaque, so the usual risk checks apply to you as well.
Related reading
This article is for general education and is not medical advice. Decisions about testing and medication should be made with your clinician. If you have chest pain or other symptoms of a heart attack, call 911.
