I don't know how much nature/nurture is involved. I assume some percentage of each in most cases. And, I'm not blaming victims nor suggesting people pull themse

I don't know how much nature/nurture is involved. I assume some percentage of each in most cases. And, I'm not blaming victims nor suggesting people pull themselves up by their bootstraps in the face of massive adversity (which is what people often appear to assume when "responsibility" is mentioned). Very simply, I don't think being overworked is the leading cause of the negative correlation between poverty and exercise (if one even exists). Instead, a confounding variable (a behavior or attitude) common to both poverty and lack of exercise exists and results in a manifestation of both (in most, but certainly not all cases).