Great book that analyzes exercise from a Biological anthropology perspective. Essentially boils down to:

exercise several hours a week, mostly cardio but also some weights, and keep it up as we age


But goes very in depth as to how strange and unusual exercise is from an evolutionary perspective, and how it requires overriding our innate instincts, and the benefits that arise by doing it today in our sedentary societies. instead of shaming and blaming people who avoid exertion, we should come from a more encouraging stance, similar to education.

A sound mind in a healthy body !