I don't really think it would have much impact on an individual. Our physiology is pretty fixed, and while we will have reactions and responses to our environment, radical re-shaping of the adult body seems unlikely to me.
Now, a couple generations in, you'll start seeing those effects. Could be that children concieved and raised in 2x standard gravity would have radical physical effects displayed. Certainly after a few generations, and given a sufficient population size, natural selection would tend to favor individuals who are stout enough to operate in that environment.
It's not often I get to describe individuals as "stout". Thanks!
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