Extreme athletic outliers are typically extreme genetic outliers. I don't foresee generalized applicable lessons for average joe unless lesson is to time travel and pick better parents.
Fair, I think what makes this case interesting is that he wasn't an athletic outlier for most of his life, so the question on how many dormant athletes are out there remains. Maybe the distribution is not as skew as one might initially think
In theory I have lean athletic build in my forties without trying. But I'm not athletic because I hate suffering. If I live to be 80 and every day is suffering redardless I might move more.