CGI Muscles?
Looks like real muscle on a body double to me and they are just using CGI to put Reynolds face on it"Never letting reality get in the way of a funny joke, Ryan Reynolds’ latest Free Guy gag has his face added to a very muscular body double. "https://www.cinemablend.com/news/2571365/ryan-reynolds-super-jacked-free-guy-video
Blah blah blah bhank bullshit.