Is Morning Exercise Really Better for Your Heart? What a New Study Suggests

Adobe Stock License

When patients ask me what time of day is best to exercise, my standard answer for years has been some version of "whenever you'll actually do it." Consistency matters more than the clock. That advice is still true. But a fascinating new study presented at the American College of Cardiology's Annual Scientific Session in March 2026 is starting to add nuance to that answer, and it's worth talking through.

The research, led by Prem Patel at the University of Massachusetts Chan Medical School, looked at more than 14,000 adults and found that people who consistently exercised in the early morning had significantly lower rates of several major cardiometabolic conditions compared to those who exercised later in the day. The differences were not small, and they held up even after researchers accounted for total activity levels, age, sex, sleep, smoking, and other lifestyle factors.

If you've been on the fence about becoming a morning exerciser, this is the kind of evidence that might tip you over.

Book an appointment with Dr. Meyer to discuss how
your workouts may be affecting your blood pressure.

What Did the Study Actually Find?

The researchers used data from the All of Us research program, a large national health initiative, and combined it with heart rate data collected by Fitbit wearable devices. Rather than asking people what kind of exercise they did, the team identified periods when participants' heart rates were elevated for at least 15 minutes at a time. That gave them an objective, minute-by-minute look at when actual physical exertion was happening over a full year.

Participants were grouped according to when they were most active during the day. The researchers then compared cardiometabolic outcomes across the groups, controlling for confounding variables.

The findings were striking. Compared to people in the lowest activity category, those who frequently exercised in the morning were:

• 31 percent less likely to have coronary artery disease

• 18 percent less likely to have high blood pressure

• 21 percent less likely to have hyperlipidemia (high cholesterol or triglycerides)

• 30 percent less likely to have Type 2 diabetes

• 38 percent less likely to be obese

The lowest odds of coronary artery disease were associated specifically with exercise between 7 a.m. and 8 a.m. People who exercised later in the day still saw cardiometabolic benefits compared to sedentary individuals, but the morning group consistently came out ahead.

This study echoes earlier research published in the European Journal of Preventive Cardiology in 2022, which followed nearly 87,000 adults from the UK Biobank for six to eight years. That study found that being most active between 8 a.m. and 11 a.m. was associated with the lowest risk of both heart disease and stroke. The pattern showed up regardless of whether participants identified themselves as early birds or night owls.

When two large independent studies using different populations and different methods point in the same direction, that's a signal worth paying attention to.

Why Might Morning Exercise Be Better?

We don't yet know for certain why morning exercise appears to confer extra cardiovascular benefit, but researchers have several plausible theories rooted in the body's circadian rhythms.

Your body operates on a 24-hour internal clock that governs everything from hormone production to blood pressure regulation to metabolism. In the morning, levels of stress hormones like cortisol naturally peak, which prepares your body for activity. Exercising during this window may help your body use those hormones productively rather than letting them contribute to inflammation and metabolic dysfunction.

Morning exercise also appears to influence how your body handles glucose and fats throughout the day. Research suggests that working out before breakfast may improve insulin sensitivity and prompt your body to burn fat more efficiently. Over time, these effects may add up to the meaningful differences in obesity, diabetes, and cardiovascular disease seen in the recent study.

There's also a behavioral piece. People who exercise in the morning tend to be more consistent over the long term. Life has a way of derailing afternoon and evening plans. Work runs late, dinner happens, the couch starts looking appealing. Morning exercisers often beat those obstacles by getting their workout in before the day's demands take over.

And then there's sleep. Some research suggests that morning exercise, particularly when combined with morning sunlight exposure, can help regulate the circadian clock and improve sleep quality at night. Better sleep, in turn, has its own substantial cardiovascular benefits, which I've written about previously on this site.

Our Concierge Medicine Services:
At Madison Avenue Cardiovascular & Concierge Medicine, Dr. Mark Meyer offers the most exclusive medical care through premier membership to our concierge medicine services, including:

• Personal Doctor

• Preferred Appointment Times

• 24/7 Urgent Care

• Own Network of Renowned Specialists

• VIP Experience

• Executive Annual Physical

• Full Body MRI Screening

• GeneticsScreening

• The Meyer Nutrition PlanIncluded

What Doesn't This Mean?

I want to be careful about a few important caveats, because I don't want anyone reading this to give up on exercise just because they can't fit it in before sunrise.

First, this study was observational, not a randomized trial. It can show an association but not prove that morning exercise directly causes better cardiovascular outcomes. There could be other differences between morning exercisers and later-in-the-day exercisers that account for some of the benefit. Morning exercisers may sleep more regularly, eat differently, or have other healthy habits that the researchers couldn't fully account for.

Second, the difference between morning exercise and later exercise was meaningful, but the difference between any exercise and no exercise remains far larger. The single most important step you can take for your cardiovascular health is to be physically active, period. If your only window to work out is at 6 p.m., go work out at 6 p.m. Don't let perfect be the enemy of good.

Third, individual circumstances matter. Some people genuinely function better as evening exercisers. People with certain medical conditions may need to time their exercise around medications or meals. Shift workers have their own circadian challenges. The research is suggesting a tendency, not a universal mandate.

Our Main Tenets for Bespoke Concierge Medical Care
At Madison Avenue Cardiovascular & Concierge Medicine medical care comes with a vision that considers the wholeness of the patient as a person in a journey for wellbeing. Dr. Mark Meyer will ensure you have premium access to the best internal medicine and cardiology medical services in New York, in the most convenient, exclusive, elegant and private setting on Madison Avenue. For more than 25 years, Dr. Meyer has provided elite medical care according to the highest standards. Now you can join our concierge membership and access the most sophisticated bespoke medical and wellness care in Manhattan.
Book an appointment with Dr. Meyer to discuss membership in his Concierge Medicine practice today.

What Are Some Practical Tips for Becoming a Morning Exerciser?

If this research has you thinking about shifting your routine, here are some strategies I share with patients who want to try.

Start small and build gradually. You don't need to wake up at 5 a.m. for an hour-long workout. A 20-minute brisk walk after you wake up is a perfectly legitimate place to begin. As your body adjusts, you can add time and intensity.

Lay out your clothes the night before. This sounds trivial, but reducing the friction between waking up and starting your workout matters. The fewer decisions you have to make in the first 10 minutes after your alarm goes off, the more likely you are to follow through.

Get sunlight as soon as possible. Stepping outside or even sitting near a window helps your circadian clock recognize that the day has started. This makes morning exercise feel more natural and supports better sleep that night.

Don't skip breakfast permanently, but consider light fueling. For most healthy adults, exercising in a fasted state in the morning is fine and may even amplify some metabolic benefits. But if you have diabetes, low blood pressure, or any history of dizziness during exercise, talk to your doctor about whether some light food or hydration beforehand makes sense.

Be realistic about sleep. Pushing your wake time earlier without also moving your bedtime earlier is a recipe for chronic sleep deprivation, which has its own significant cardiovascular consequences. Aim for at least seven hours of sleep per night, and shift both your bedtime and wake time gradually if you're transitioning to morning workouts.

The new ACC research adds to a growing body of evidence suggesting that morning may be the most beneficial time of day to exercise for cardiovascular and metabolic health. The associations seen in this study are substantial: more than 30 percent reductions in coronary artery disease and Type 2 diabetes among morning exercisers compared to sedentary individuals.

But the most important thing you can do for your heart is to move your body regularly. If morning works for your schedule, lean into it. If your only realistic option is later in the day, that's still vastly better than not exercising at all. The research is starting to refine our advice, not rewrite the basic playbook.

Pay attention to consistency. Pay attention to intensity. And if you can swing it, set the alarm a little earlier and let your heart reap the extra rewards.

Sources

1. American College of Cardiology. "Rise and Sweat! Morning Exercise Linked With Lower Cardiometabolic Risk." Press Release. March 19, 2026. https://www.acc.org/About-ACC/Press-Releases/2026/03/18/20/45/Rise-and-Sweat-Morning-Exercise-Linked-with-Lower-Cardiometabolic-Risk

2. Patel P, et al. "Exercise Timing and Relationship With Cardiometabolic Disease." Presented at the American College of Cardiology Annual Scientific Session (ACC.26), New Orleans, March 29, 2026.

3. Albalak G, Stijntjes M, van Bodegom D, et al. "Setting Your Clock: Associations Between Timing of Objective Physical Activity and Cardiovascular Disease Risk in the General Population." European Journal of Preventive Cardiology. 2023;30(3):232-240. https://academic.oup.com/eurjpc/article/30/3/232/6809665

4. Healthday. "ACC: Early Morning Best Time to Exercise for Cardiometabolic Risk Reduction." March 19, 2026. https://www.healthday.com/healthpro-news/cardiovascular-diseases/acc-early-morning-best-time-to-exercise-for-cardiometabolic-risk-reduction

5. Medical Xpress. "Morning Workouts Tied to Lower Cardiometabolic Risk in Fitbit Study of 14,000." March 19, 2026. https://medicalxpress.com/news/2026-03-morning-workouts-cardiometabolic-fitbit.html

6. Gabriel BM, Zierath JR. "Circadian Rhythms and Exercise: Re-Setting the Clock in Metabolic Disease." Nature Reviews Endocrinology. 2019;15(4):197-206. https://pubmed.ncbi.nlm.nih.gov/30700804/

7. American Heart Association. "Recommendations for Physical Activity in Adults and Kids." https://www.heart.org/en/healthy-living/fitness/fitness-basics/aha-recs-for-physical-activity-in-adults

8. Harvard Health Publishing. "The Best Time of Day to Exercise." Harvard Medical School. https://www.health.harvard.edu/exercise-and-fitness/the-best-time-of-day-to-exercise