Key points from article :
Current World Health Organisation recommendation is 150 minutes of brisk walking or 75 minutes of running each week.
Big drop in disease risk up to 5x recommended minimum exercise.
Benefit continued to increase up to 15x the minimum, i.e. 19 hours running per week.
higher level of total physical activity is strongly associated with a lower risk of breast cancer, colon cancer, diabetes, ischemic heart disease, and ischemic stroke.
Meta-study of 74 studies published between 1980 and 2016.