A heart in motion: what science says about exercise and cardiovascular health

Diseases of the heart and blood vessels are the leading cause of death worldwide. The good news is that one of the most powerful tools to prevent them can’t be bought at a pharmacy: it’s movement. The scientific evidence is overwhelming and consistent — staying physically active protects the heart, the arteries and circulation at any age. Here are five solid lines of evidence and what they mean for your daily life.

1. Less cardiovascular disease (and the biggest gain is in getting started)

This is the strongest evidence. A meta-analysis pooling 196 studies and more than 30 million people showed that reaching the equivalent of the recommended 150 minutes of weekly activity lowered the risk of developing cardiovascular disease by about 27%, and the risk of cardiovascular death by about 29% (Garcia et al., 2023).

The most encouraging finding is the shape of the curve: the biggest benefit comes from moving from no activity at all to some activity. Beyond that, the benefits keep adding up, but more gradually. The authors estimated that if everyone who is insufficiently active reached that minimum level, around 15.7% of premature deaths could be prevented (Garcia et al., 2023). In other words, the best investment for your heart is getting off the couch.

2. A shield against coronary heart disease

Coronary heart disease — the kind that narrows the heart’s arteries and causes heart attacks — also responds to exercise. A meta-analysis focused on this outcome found that people meeting the basic activity recommendation had a 14% lower risk of coronary heart disease, and those doing twice that amount had a 20% lower risk (Sattelmair et al., 2011).

And again, you don’t need to hit the perfect minimum to start benefiting: the same analysis found lower risk even in people active below the recommended threshold, reinforcing the idea that some activity is always better than none (Sattelmair et al., 2011).

3. It helps control blood pressure

High blood pressure is one of the main cardiovascular risk factors, and exercise acts on it directly. A landmark systematic review and meta-analysis concluded that regular structured exercise — especially aerobic exercise such as brisk walking, swimming or cycling — consistently lowers resting blood pressure (Cornelissen & Smart, 2013).

The reductions are clinically meaningful and larger in people who already have hypertension than in those with normal values (Cornelissen & Smart, 2013). Because even modest reductions in blood pressure translate, at population level, into fewer heart attacks and strokes, exercise is considered one of the first non-drug recommendations for blood pressure control.

4. How much to do, according to the evidence

After reviewing thousands of studies, the World Health Organization turns all this evidence into a clear, achievable recipe for adults (Bull et al., 2020):

• 150 to 300 minutes per week of moderate-intensity aerobic activity (brisk walking, dancing, cycling), or 75 to 150 minutes of vigorous intensity, or a combination of both.
• Muscle-strengthening activities on at least two days a week.
• Reducing sitting time and replacing it, whenever possible, with movement of any intensity.

The same guidelines stress that regular physical activity reduces the risk of cardiovascular disease and hypertension, among other benefits for overall health (Bull et al., 2020).

5. Even a small amount counts

If you think you don’t have time to “exercise properly”, this evidence is for you. In a meta-analysis of initially healthy women, physical activity was associated with lower cardiovascular risk in a dose–response manner, with benefit seen even when walking around one hour per week (Oguma & Shinoda-Tagawa, 2004).

The message, consistent with the rest of the evidence, is freeing: you don’t need a perfect routine to protect your heart. Inactive people gain the most from any increase in movement, and it’s never too late to start (Oguma & Shinoda-Tagawa, 2004; Garcia et al., 2023).