Was about to say this, but then I thought about it. I haven't really ran since HS Cross Country, haven't had the need to. If I tried to jog half a mile now, it would be flat out running, but pretty sure if I got my fat ass into shape that I would be able to get to at least a 7 minute mile, but running seems harsh now. Unless something is trying to kill me, I don't see me doing more than fast walking.
I have lost 30lbs since March but I have had to do as GH has said, make some sort of exercise a part of daily life, which is usually walking 3 miles while pushing "mini-me" in his stroller everyday that I can and make the lifestyle change of eating better.
Yeah, I'm certainly not one to preach about fitness; I haven't ran since intramural sports in college, and haven't worked out regularly in about a year and a half.
I don't necessarily know that I could get up and jog a half mile in five minutes right now, but in three weeks? Definitely a possibility. Not to be the dork who always pulls out statistics, numbers, and other shit, but the average walking pace is 2-3 miles per hour. At that rate, you'd walk a quarter of a mile in five minutes. Given that fact, a half mile in five minutes doesn't require that much speed to really qualify as "flat out running."