Physical activity and the reduction of all-cause mortality, from 2 very large prospective cohorts 1. The relationship is non-linear, suggesting a threshold effect for many types of exercise as seen below

2. Engaging in > 1 type of physical activity was generally correlated with better outcomes compared with 1 type (T1,2,3)

The @BMJMedicine was supposed to post this paper 2 hours ago but has failed to do. It is being covered by other means Someday the link will be active!

As many commenters have noted, walking is notably effective as a physical activity, here compared with the other types of exercise for dose-response vs all-cause mortality in the 2 large cohorts