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I don't think he's looking to fly military fighters. Nobody sustains 7-9G in any piston plane, aerobatics or not. The Unlimited monoplanes might pull G is this range, but it'll only last about 1 second. There's no need to pull more than about 4.5G at the Sportsman level. And even at that, the G is experienced for very short amounts of time. You really don't have to be in great shape to fly aerobatics, or even competition acro. If you came to a contest you might be surprised that many guys have the same beer guts that non-acro guys have. :-)
Oh, I know. I know a lot of military pilots who are rather flabby too. The point is not the actual level of fitness but the cardiac issues that tend to lurk asymptomatically in those of us with a sedentary lifestyle. I agree that there's no need to pull more than 4.5 g but would say that it extends beyond the sportsman level to include