Rather significant leap to take given the average hours worked per week in the US are over 40 and the % of US adults classified as obese is something like 40% or more as well - lots of candidate individuals out there. You really going to claim it's impossible for someone to be doing manual labor 60+ hours a week to pay rent and also have weight problems? Exercise doesn't automatically make you lose weight, high calorie intake or metabolic issues etc could cancel it out no problem. If it was as simple as 'just exercise a lot' weight issues wouldn't be so widespread.
