Physical inactivity makes you fat, right? Most people on the street would probably agree with this supposition; popular science contends that lack of exercise means lower caloric expenditure, which translates to weight gain unless we reduce caloric intake. If we then inquire about why obese individuals tend to exercise less (on average) than leaner folks, many respondents would attribute the difference to laziness, lack of willpower, and less discipline among the former.

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