Now there is good news for those who fear it might be too late in life to improve their fitness.
People into late middle age can reverse or reduce the risk of heart failure caused by decades of sedentary living by exercising, a study has found.
But there is a catch - it takes two years of aerobic exercise, four to five days a week, researchers said.
[For more on this story by Alex Therrien, go to http://www.bbc.com/news/health-42565137]
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