Possibly relevant to this discussion.
If the Alabama witnesses to John Henry are correct, he was not an unusually large man. Quite the contrary, he appears to have been rather short. One person said that he weighed about 150 lb but I think that must be an underestimate. I imagine 5'8" and 165 lb myself. That weight is pure speculation, of course, but several witnesses agree that he was not large.
It is said that he entered steel driving contests and always won.
If this is true, then it may demonstrate that steel driving is more a matter of technique, and perhaps strength and endurance, than size.