To be Mr. Olympia? Drive, certainly. But if you don’t have elite tier genetics, absolutely no chance despite infinite drive. I.e. uniformly big muscle bellies, higher proportion of type2 muscles fibers, high androgen receptor density, longer legs, small waist/hips, myostatin gene mutations, and (perhaps most importantly) excellent response to steroids.

Or, in the case of Arnold’s farcical 1980 Olympia win, outright corruption.