I don't know why, but Pervis Ellison just popped into my mind. Freakishly athletic, Center, 6'9"...drafted #1.
Sometimes athletically competent (although I consider a big man who can run the floor, can jump, and has quick lateral movement to be athletically gifted), legit. 7' with long arms, healthy, can run the court is worth more than the highest accolades. Body building, if that is what is called for, and I am not sure that it is, can be added later. Both Kareem and Chief used martial arts rather than weight lifting to stay healthy, inshape, and limber. As someone said, the amount of running necessary to play soccer should make him well able to handle the up and down of basketball (and so far that seems to be the case).