I don't think a potential lack of iron bothered Jack Johnson much:

1:25
And when you're talking of Jack Johnson, you're talking of a way different era from a century ago.
You can't compare a Usain Bolt to a runner from 20 years ago, but you have a Bernard Hopkins around in boxing that has fought for over 20 years. I believe that alone shows boxing to be different. Experience and skill can overcome a gap in athleticism and youth.

1:25
And when you're talking of Jack Johnson, you're talking of a way different era from a century ago.
You can't compare a Usain Bolt to a runner from 20 years ago, but you have a Bernard Hopkins around in boxing that has fought for over 20 years. I believe that alone shows boxing to be different. Experience and skill can overcome a gap in athleticism and youth.

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