15 minutes of exercise a day can boost life expectancy by three years...

Just 15 minutes of exercise a day can boost life expectancy by three years and cut death risk by 14%, research from Taiwan suggests. An expert group in the UK said that this would be considered the minimum amount to gain any benefit  but say that 15 minutes a day is a good place to start for those who currently do little or no exercise.
"The Lancet study, based on a review of more than 400,000 people in Taiwan, showed 15 minutes per day or 90 minutes per week of moderate exercise, such as brisk walking, can add three years to your life.

More exercise led to further life gains. Every additional 15 minutes of daily exercise further reduced all-cause death rates by 4%.

And research from Australia on health risks linked to TV viewing suggest too much time sat in front of the box can shorten life expectancy, presumably because viewers who watch a lot of telly do little or no exercise."

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