Running sucked when I was fat, still sucks now that I'm fit. I can just run faster, which means the suck lasts less....lol. I always thought that it's way easier when you are slim, but since losing weight, I've accepted that I'm just not an endurance athlete. I remember being bitter as hell after I trained my ass off for a 5K only to have my skinny-fat ex beat my time in the same race by like 25% without a single day of training! He couldn't lift a weight for the life of him, though.