How much exercise do you really need to protect your heart?
The World Health Organization and most national health bodies recommend at least 150 minutes of moderate-intensity exercise, or 75 minutes of vigorous exercise, each week for adults. That threshold has anchored public health messaging for years, built on the idea that some movement is always better than none.
A newly published large-scale cohort study, however, suggests that hitting the minimum recommended dose delivers a smaller cardiovascular payoff than many assumed. Researchers tracking participants who exercised at roughly the recommended level found only a modest reduction in heart attack and stroke risk compared with sedentary peers.
According to the study, substantially greater protection appears to require roughly 560 to 610 minutes a week — the equivalent of 80 to 90 minutes a day of brisk walking, running, cycling, or similar activity. That is close to four times the current official recommendation.
The findings point to a dose-response relationship rather than a simple on-off switch: each additional minute of activity does not deliver identical returns, but cumulative protection continues to climb meaningfully as total weekly volume rises.
Researchers were careful to stress that the results should not discourage people from meeting the existing 150-minute benchmark. That level still confers measurable benefit — it simply appears less sufficient, on its own, to maximize protection against major cardiac events than previously assumed.
The study's activity measurements combined structured exercise with everyday movement, including walking or cycling to work, housework, and stair climbing, rather than requiring gym-based training exclusively. Reaching the higher threshold, in other words, does not necessarily mean formal workouts.
Cardiovascular disease remains the leading cause of death worldwide, and a large share of cases are considered preventable through lifestyle factors including physical activity. That makes the real-world achievability of exercise guidelines a central question for public health planners.
Experts do not expect health authorities to abandon the 150-minute guideline outright, since it remains a realistic and measurable entry point for the broader population. But the new data strengthens the case for messaging that frames more activity as meaningfully better, rather than treating 150 minutes as a ceiling.
The researchers also noted that intensity mattered alongside duration: brisk-paced walking produced considerably greater cardiovascular benefit than a slow stroll of the same length, offering a practical takeaway for people with limited time to exercise.
Taken together, the study frames current exercise guidelines as a floor rather than a ceiling — a starting point that people aiming for maximum heart protection may want to build on gradually over time.
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