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I'm intrigued by the 'non-responder' genetic predisposition: does this mean that no matter what form of exercise he does, and no matter how much, his fitness will NEVER improve?!

No, they just respond more slowly. That study had people doing four hours of exercise a week. That is not very much. A lot of people would exceed that in one training session (e.g. someone training for an endurance event like a triathlon). Furthermore, there are more facets to fitness than endurance. Strength, flexibility, balance, and so on are all important to fitness, whether you define fitness in terms of quality of life or athletic achievement.

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