US over 40s could live extra 5 years if they were all as active as top 25% of population

If every American over the age of 40 was as physically active as the top 25% of the population, they could expect to live an extra 5 years, on average.

And if the least physically active matched the level of the most physically active, they would need to clock up an extra 111 minutes of walking at 4.8 km/hour every day.

This could increase their life expectancy by nearly 11 years .