The returns to exercise seem pretty small
Suppose one exercises at the moderate level:
per year that is 130 hours = 52 (weeks)*5 (days)*.5 hours
over 50 years that is: 6,500 hours
There are 5,840 waking hours in a year. 8,175 over 1.4 years. At any reasonable interest rate, in terms of purely longevity, there is a strong negative return to exercise. For this to pay off, one must really enjoy the process of exercise or that it greatly improves the quality of life.
Beyond all that is the issue of the type of people who exercise. My guess is that the people who exercise generally tend to be more educated and have other characteristics (e.g., being married because they take care of themselves) that are associated with longer life expectancies. There is no mention that the study controls for such factors as income, education, and marriage.
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