VIDEO : It's Always Sunny Star Gets Real About Hollywood Expectations Of Body Image

"It's Always Sunny in Philadelphia" star Rob McElhenney, posted a picture of himself looking fit on Instagram as the show returned for its 13th season.
It's side-by-side with an older still from him looking much less put-together.
He wrote about the intense, seven-month routine to get in shape ? including hiring a personal trainer from "Magic Mike" ? and said FX paid for the whole thing.
"I don't know why everyone's not doing this.