• A few minutes of harder exercise each day may dramatically lower your risk of major diseases.
• New research suggests exercise intensity, not just total minutes, plays a critical role in prevention.
• Adding short bursts of vigorous activity to your day could be a simple, efficient way to improve long-term health outcomes.

Exercise intensity, not just volume, is essential to reduce the risk of serious conditions, including type 2 diabetes, cardiovascular disease, and dementia, according to a new study.

Physical activity guidelines tend to focus on how much, or total volume, people should exercise each week. For the average adult, that recommendation is about 150 minutesTrusted Source . Those recommendations emphasize duration but offer less guidance on how hard people should exercise.

But a new study published on Sunday in the European Heart Journal found that people who get even small amounts of vigorous exercise each day may be less likely to develop eight major diseases.

“In our study, even a small proportion of vigorous activity—just over 4% of total activity, which may translate to only a few minutes per day—was associated with meaningful health benefits,” Minxue Shen, PhD, a professor at Xiangya School of Public Health, Central South University, Changsha, China, and co-author of the research, told Healthline.

Vigorous doesn’t mean extreme, but it should be enough to mean that you are breathing hard and can’t speak more than a few words at a time. Shen told Healthline that even everyday activities like carrying heavy groceries or climbing stairs quickly can be intense enough to count.

Compared to people who participated in no vigorous exercise throughout the day, those who did had a reduced risk of death (all-cause mortality), cardiovascular disease, type 2 diabetes, dementia, and more.

For some diseases, both volume and intensity were important, but for others, like immune-related conditions, the benefit relied almost entirely on intensity.

Although the study is observational, meaning it doesn’t establish a causal link between exercise intensity and specific health conditions, the results align with other research suggesting that there’s more to physical activity than just volume.

The researchers used data from the UK Biobank, which includes de-identified health data for half a million adults living in the United Kingdom.

For their analysis, they focused on two groups:

• about 96,000 participants who had their physical activity objectively measured using wrist-worn fitness trackers
• a much larger group of about 375,000 participants who self-reported their physical activity

The fitness trackers continuously logged movement over a 7-day period, allowing researchers to estimate not only how much people moved but also how intense their activity was.

Participants were on average 56 to 62 years old, and just over half were women. Researchers calculated each person’s total physical activity and the proportion that qualified as “vigorous” exercise, defined as higher-intensity movement such as running. Participants were followed for about 9 years in the device-measured group and over 14 years in the self-reported group.

During that period, researchers tracked whether they developed any of eight major chronic conditions:

• type 2 diabetes
• dementia
• chronic kidney disease (CKD)
• atrial fibrillation (AFib)
• immune-mediated inflammatory diseases (such as rheumatoid arthritis)
• metabolic dysfunction–associated steatotic liver disease (MASLD), formerly fatty liver disease
• cardiovascular disease
• chronic Respiratory Disease (such as COPD)

Across both datasets, people who did a higher proportion of vigorous exercise had consistently lower risks of developing major diseases, even when their total amount of exercise was the same.

“This study moves beyond the simple question of ‘How much exercise?’ and really examines how the intensity of that exercise matters,” said Denice Ichinoe, DO, an assistant professor in the department of family and community medicine at the Kirk Kerkorian School of Medicine at the University of Nevada, Las Vegas. Ichinoe wasn’t involved in the research.

“In other words,” she adds, “moving more is essential, but how hard you move can further influence long-term health outcomes.”

The relationship followed a dose–response pattern, meaning the more vigorous the exercise, the greater the benefit. However, the risk reduction plateaued once vigorous activity accounted for about 4% to 5% of total activity, suggesting there’s no need to go overboard with strenuous activity.

In the group using fitness trackers, those who got more than 4% of their activity from vigorous exercise had substantially lower risk than those who did none. For example, they had about a 31% lower risk of major cardiovascular events, a 60% lower risk of type 2 diabetes, and a 63% lower risk of dementia.

That pattern held across a wide range of conditions.

Higher-intensity activity was linked to roughly 60% lower risk of type 2 diabetes, 63% lower risk of dementia, and 46% lower risk of death. Importantly, these benefits were evident even at relatively low levels of vigorous activity.

The researchers also found that some diseases reacted differently to exercise.

“We observed that different diseases showed different patterns—some were mainly influenced by intensity, while others were associated with both intensity and total activity,” Shen said.

Reduction in risk for immune-mediated inflammatory diseases and dementia was driven almost entirely by exercise intensity. Meanwhile, for metabolic conditions like diabetes, both intensity and total activity mattered.