Fitness is relative. I'm not sure what feats Lizzo has done (any vids?) but in terms of "she can do calisthenics I am not able to do" she might mog me in that respect.
She might even be athletic/fit in respect to the average populace, but only because of mass sedentary life style.
Pro wrestlers are a good example of this type of thing. For example, Otis Dozovic of the tag team "Heavy Machinery" on WWE Smackdown these days can do "the caterpillar" (ie "the worm")
I have less body fat than that guy, but I can't do that. He can do a lot of other stuff (lift heavy guys, spin around carrying them) which I can't do either:
A big part of that is probably because he has way more muscle than I do. Plus training skills to be efficient.
Lizzy looks to be about +20% body fast compared to Otis though. She doesn't look like she's that muscular. Maybe she can do some leg stuff like splits? I dunno. Upper body looks pathetic, but that's usual for women.
Nevertheless, she might mog me by being able to do a cartwheel or some shit. I think that's largely skill. I have the strength to briefly support my bodyweight on my hands, I'm just terrified of fucking up and breaking my neck, so it's fear and lack of skill more than body composition which stop me.