Talk:Saitama/@comment-2A00:23C5:11A1:3900:11BC:C527:E76:B2ED-20190825175134

I'm guessing that Saitama did another kind of training as well. Maybe similar to how muay thai fighters kick trees to give their shins microfractures so the resulting bone grows back harder/denser. Just imagine how many times he would have had to break himself continually to get that hard.