I remember being fat and doing sports. It IS harder. That's why I magically go faster now that I'm normal weight. Because instead of walking the same speed, not breaking into a sweat like I used to and worship fat people doing sports, I prefer to expend myself just the same and stay "50000 times more hardcore".  Pro tip: Those fat people she's talking about aren't even sincerely exercising - they are just in for the selfies and excuses.