- Researchers say short bursts of high-intensity exercise adding up to around 30 minutes a week may still improve cardiovascular fitness and long-term health.
- The key is not total time alone, but whether the effort is hard enough to leave you noticeably out of breath.
- This is not a free pass to do the bare minimum, but it does suggest the health bar may be lower and more realistic than many people think.
For years, public health advice has told people to aim for at least 150 minutes of moderate exercise each week.
That remains a sensible benchmark, but new research argues that meaningful benefits can still come from much less, provided the effort is intense enough.
Researchers at the Norwegian University of Science and Technology say around 30 minutes of high-intensity exercise a week may be enough to improve cardiovascular fitness.
That works out at only a few minutes a day.
The crucial point is intensity.
These are not gentle strolls or casual movements.
The activity needs to push you hard enough that you are clearly short of breath and cannot talk comfortably in full sentences.
That could mean brisk uphill walking for one person and hard cycling intervals for another.
The exact exercise matters less than how demanding it feels for your current level of fitness.
The researchers argue that cardiovascular fitness is one of the best indicators of present and future health.
Higher fitness levels are linked to lower risk of dozens of chronic diseases and lower risk of early death.
They also highlight a practical point.
Many people say they do not exercise because they do not have time.
Short, intense sessions obviously will not suit everyone, but they do remove one common excuse.
That said, the message should not be distorted.
This is not evidence that 30 minutes a week is ideal, or that longer and more regular activity offers no extra benefit.
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It is better understood as a minimum threshold that may still move the needle.
The researchers also say it is best to spread exercise across the week rather than cram it into one session.
That is because blood pressure and blood sugar control can improve for a day or two after a hard workout.
So the practical takeaway is simple.
If you cannot do hours of exercise, do not assume it is pointless to try.
A few hard efforts each week may still be far better than nothing.
