Elixir
Made in America
You can be skinny and fit. But yeah, with some obviously fat people I do notice that they move remarkably well. I think I would have been dead if I somehow got their weight. They clearly have more muscles to carry that fat around.
There is a misguided trope called the "Body Mass Index" that set me off on this tangent. As if some meaningful health info can reliably be derived simply from a ratio of height to weight...
As a friend of mine once observed, "A six foot high, 200lb stack of plutonium would have the same BMI as a six foot high 200lb stack of Cool Whip."