The internet gets a little funny about highly-anticipated games we know almost nothing about. I once covered an fan modding a made-up "elden ring" into Skyrim before Elden Ring came out, since people were going stir crazy for the next trailer. Fans are having similar reactions to GTA 6, and now they're analyzing protagonist Jason's muscles.
Jason's a pretty fit man, it seems based on Rockstar's two existing GTA 6 trailers. That should be inconsequential, but since it's been months and months of fans waiting for trailer three, minutiae is starting to look more interesting. People started making gameplay presumptions based on how Jason looks in two choice moments.
"Do these two screenshots essentially confirm that fitness/bodybuilding is in the game?" says an account on Twitter sharing a pair of images showing off Jason's back. "Jason looks noticeably more muscular in one image than the other, particularly in his back, shoulders, and arms."