Cardiovascular disease is the number one cause of death in the United States. Nearly 130 million adults in the U.S. have some form of cardiovascular disease, according to 2025 data from the American Heart Association. The question remains as to how to lower one’s chances of getting it.
Prevention
Research has consistently shown that a combination of lifestyle and dietary choices, including a commitment to regular exercise, can help prevent heart disease. A new study even suggests a time of day for physical activity that could help optimize your heart health.
Test
Using data collected by the Study of Muscle, Mobility, and Aging, researchers analyzed data from 799 participants, with an average age of 76 years. These participants wore wrist-worn accelerometers (devices that measure movement) for seven days. They also underwent a heart and lung stress test and were measured for the amount of energy they expended relative to their walking effort.
Results
The results suggested that people who exercised earlier in the day—and at the same time every day—experienced the greatest cardiovascular benefits. This was regardless of the activity they chose or the length of the workout.
In other words, the most important part is showing up most every day—notes the American Heart Association: “The key is to do what’s most likely to work consistently for you.
If you’re still looking to nail down that ideal hour, a 2023 study in Obesity concluded that exercise between 7 and 9 a.m. was linked to a lower body mass index. Another study published in Vascular Health and Risk Management suggested that working out at 7 a.m. could improve blood pressure. The Mayo Clinic echoes other expert sources in suggesting 30 minutes of moderate activity is a solid target for your health.
