I'd say thats probably true, but likely has more to do with training than diet. I would do intervals of walking/running while pushing my son in his stroller an

I'd say thats probably true, but likely has more to do with training than diet. I would do intervals of walking/running while pushing my son in his stroller and have no problem with it, even while quite overweight and never being a runner. I shocked myself the first time I did 3 miles without really thinking about it or feeling very winded.