Yeah, that was covered in the message boards as well. Only one person of intelligence had an answer, that in reality astronauts need to exercise up to 3 times a day to maintain muscle mass in anti-gravity. To expect the human population to stick to such a regimen for 700 years is stretching the imagination a bit.

And people who are upset by it need to look around. Just in my viewing alone there had to be four people (parents) for whom this physique was a not-so-far-off reality.