Is it normal for a short fat girl to be stronger than a tall skinny guy?

your GF sounds hot.

Answering other questions above (*):
* She and I never ran long distances (e.g. 3 miles) together or played one-on-one basketball against each other or other activities where we both knew I would have the advantage because of my small size vs. her large size or because of my towering height over her (we always preferred engaging in various "her vs. me" physical tests of strength). However, she and I and several of her girlfriends ran the 50-yard dash (the only time she and I ran a 50-yard dash together). Because she had such powerful legs, despite her greater weight over all of the other girls (and, of course, despite her much greater weight over me!!!), she succeeded in outrunning all but two of the other girls and she came very close (within only a few feet) of outrunning me (SHE ALMOST OUTRAN ME!!!).
* Yes, excess weight increases the chances for health problems but not everyone carrying excess weight develops health problems just as not everyone who smokes develops health problems. There are plenty of people, both male and female, carrying excess weight, who are very healthy and incredibly strong!!!
* She never wanted to climb rocks using only her fingers, even if she could. Most people as skinny as I am would have little or no difficulty climbing rocks using only their fingers. I consider that to be an unfair comparison. It doesn't take a whole lot of strength for people as skinny as I am to do such rock climbing although I do not climb rocks myself.

Yes. Her dominance turned me on. And it turned her on, too!!!
Actually, center of gravity may be a factor in wrestling but certainly not in weightlifting.

Doesn't sound that weird. Sometimes girls have big muscles and stuff, sometimes guys have small muscles and stuff.

I've known some skinny wiry dudes that were fucking strong as hell. For instance most rock climbers are very skinny, but the can crawl up a rock face using only their fingers. Let's see your fatty do that.

So the real question here is did her dominance turn you on, cowboy? Mwahahaha... Also I imagine she's sturdier on her feet as she has a much lower center center of gravity, but that extra weight will catch up with her in the form of high blood pressure, diabetes and back and joint pain.

so challenge her to a 3 mile run or play a gamea one on one basketball or even asker to grab somethin from the top shelf

thatll learner there jack spratt