How much longer do you live from fifteen minutes of exercise a day?
Just fifteen minutes of moderate exercise a day is associated with an average of 3 years of longer life expectancy. Doing more yields more benefit, but even this minimum makes a measurable difference.
Just 15 minutes of moderate exercise a day is associated with an average of 3 years of longer life expectancy and a 14% lower risk of dying, compared with people who do almost nothing. This comes from a Taiwanese cohort of more than 400,000 people followed for many years. It is an association, not a proven cause, but the magnitude is impressive for so little time.
More exercise helps further: every additional 15 minutes on top of that minimum lowers the risk of death by a further 4% and the risk of dying from cancer by 1%. Those who meet the official guideline (roughly 150 to 300 minutes of moderate exercise per week) have a 31% lower risk of death than those who do nothing. The dose-response relationship is therefore clearly present, even if the gains level off beyond a certain point.
The effect of exercise is equally striking when viewed in reverse. Swapping 20 minutes of moderate exercise for extra sitting time raises the risk of death by 26%. And those who sit for more than 8 hours a day only fully neutralise that elevated risk if they do around 60 to 75 minutes of moderate exercise per day. A quarter of an hour is therefore a good start, but more continues to pay off.
Exercise is just one link in a broader chain. Those who also quit smoking, eat healthily, drink in moderation and maintain a healthy weight gain an average of 12 to 14 years of life compared with people who lack those habits. Exactly how much exercise contributes to that cannot be stated precisely, but its share is clearly present.
The strongest figure (3 years of longer life at 15 minutes a day) comes from a Taiwanese cohort of more than 400,000 people. A second large pooled analysis of more than 660,000 people confirms that even a little exercise substantially lowers the risk of death. An analysis of more than 1 million people adds the sitting risk to that picture. Participants were followed but were not assigned any activity, so cause and effect cannot be firmly separated: it is possible that healthier people simply move more anyway. The researchers themselves acknowledge that limitations in how exercise was measured may influence the outcomes.
How many extra years of life does regular walking provide?
Regular walking is associated with two to six extra years of life, with the greatest gain for people who currently barely move. Even half an hour per day makes a measurable difference.
Does your balance on one leg say something about your life expectancy?
In people between the ages of 65 and 80, your balance on one leg does say something about your health risk, but it is a signal, not a prediction: a poor score is a reason to work on strength and balance, not a reason to worry without doing so.