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The decades-old advice of exercising for 30 minutes a day may not benefit everyone, scientists have claimed.
A study has shown that alternatively, three minutes of exercise for every hour spent seated could extend a life by 30%.
Research led by Glasgow Caledonian University found that sitting too long could even "undo" benefits of exercise.
Lead scientists said there was no "one-size-fits-all" approach to physical activity.
The four-year study, published in the British Journal of Sports Medicine, analysed data from six previous studies including more than 130,000 adults in the UK, US and Sweden.
It looked at how different combinations of activities - from running and brisk walking to housework and sitting - affect mortality.
Researchers found the current recommendation of 30 minutes of exercise per day reduced the odds of early death by up to 80% for some - those who sat for less than seven hours.
However it did not reduce mortality risk for individuals who sat for more than 11 to 12 hours per day.
www.bbc.com
A study has shown that alternatively, three minutes of exercise for every hour spent seated could extend a life by 30%.
Research led by Glasgow Caledonian University found that sitting too long could even "undo" benefits of exercise.
Lead scientists said there was no "one-size-fits-all" approach to physical activity.
The four-year study, published in the British Journal of Sports Medicine, analysed data from six previous studies including more than 130,000 adults in the UK, US and Sweden.
It looked at how different combinations of activities - from running and brisk walking to housework and sitting - affect mortality.
Researchers found the current recommendation of 30 minutes of exercise per day reduced the odds of early death by up to 80% for some - those who sat for less than seven hours.
However it did not reduce mortality risk for individuals who sat for more than 11 to 12 hours per day.
Daily 30-minute workout 'may not benefit everyone'
Glasgow Caledonian University scientists say the exercise you need depends on how long you spend seated each day.
www.bbc.com
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