Fast is about Speed , whereas Athletic is more about movement I would say.
An example would be my old mate Amir Khan. He's very quick with his hands, but his athleticism and movement isn't anything to write home about, and his stamina isn't great , and I think that also comes under athletic.
Whereas Someone like RJJ had both, (Mind you, RJJ had everything in his peak!)
I'm sure others will disagree or explain it better, but that's how I see it.
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