It’s hard to imagine after years of Chris Evans in the role that John Krasinski was at one point incredibly
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to becoming Marvel Studio’s Captain America. Krasinski dropped out at pretty much the final hurdle, but according to him, the reason he knew he wouldn’t get it? Chris Hemsworth’s abs.
Source: io9 – The Sight of Chris Hemsworth’s Body Convinced John Krasinski Not to Be Captain America