The number most people have heard is 150. That is the weekly exercise target recommended by the World Health Organization, measured in minutes of moderate activity. It is the figure printed on public health posters and cited by family doctors during annual checkups. A new study involving more than 17,000 adults suggests that number may be a floor, not a goal.
The research, which drew on data from the UK Biobank and tracked participants over nearly eight years, found that adults who exercised between 560 and 610 minutes per week at moderate to vigorous intensity reduced their cardiovascular risk by more than 30% compared to those who were inactive. Adults who met only the 150-minute guideline saw an 8 to 9% reduction. That gap is significant, and it raises questions about what current public health messaging is actually promising people.
What the study measured and how
Participants wore wrist-based activity trackers and completed exercise testing to estimate their VO2 max, which measures how efficiently the body delivers oxygen during physical exertion and serves as one of the cleaner indicators of cardiovascular fitness. Over the course of the study period, researchers recorded more than 1,200 cardiovascular events, including atrial fibrillation, heart attacks, heart failure, and strokes.
The data allowed researchers to map the relationship between weekly exercise volume and cardiovascular outcomes across a large, real-world population rather than a controlled clinical setting. The pattern that emerged was consistent. More exercise produced better outcomes, and the benefits did not plateau at 150 minutes.
Personalized targets and what fitness level changes
One of the more nuanced findings involves the role of baseline fitness. Participants with lower cardiorespiratory fitness needed roughly 370 minutes of moderate to vigorous activity per week to reduce their cardiovascular risk by 20%. Participants with higher fitness levels reached the same 20% reduction at around 340 minutes. The difference is not dramatic, but it suggests that a single universal target misses the variation in what different bodies require.
Dr. Ziheng Ning, the study’s lead author, was clear that the current WHO guidelines are not wrong. They are achievable, grounded in evidence, and beneficial for a large portion of the population. His position is that 150 minutes functions as a minimum threshold rather than an optimal one, and that future guidelines could reasonably account for individual fitness levels, age, and cardiovascular risk when setting targets.
Building toward higher exercise volume
The practical challenge is time. Getting from 150 minutes to 560 or 610 minutes per week is a substantial shift, and framing it as an immediate target would discourage most people before they started. The more useful framing is incremental. Small additions to an existing routine accumulate. A brisk 20-minute walk added to three days per week is an extra 60 minutes. Cycling to work twice a week instead of once adds more. Recreational sports, hiking, and stair use all count toward the total.
The researchers emphasize consistency over intensity. Building movement into daily patterns tends to produce more durable results than scheduling formal exercise sessions that require motivation to sustain. The cardiovascular system responds to volume over time, and that volume does not have to come from a gym.
The 150-minute recommendation was never meant to describe the upper limit of what exercise could do for the heart. The new research makes that clearer than most guidelines have been willing to say.
