Ryan Hall??? He was dangerously on the skinny side.
If you're talking about marathon runners, then have a look at Sisay Lemma (Valencia 2023 winner) and Fiyesa Lilesa (Rio Olympic silver). There's a few on the US scene as well who are on the bigger side, CJ Albertson already looks pretty big, but he is hardly elite compared to those guys ^^
Not exactly elite in a pure running sense, but I'd imagine decathletes would probably give you the best ballpark of the best times actual buff people could put up.
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