This statement only reinforces the false ideas fatties have that anyone who isn't obese is working out constantly, that they can out-waddle their shitty diets, and that they're totally eating healthy but packing on the pounds because they rolled an ankle or can't afford a gym membership or whatever excuse they have for being a motionless turd.  It doesn't take ANY exercise whatsoever to not be fat (being fit is another matter entirely); you just have to not eat more than you burn.