He’s already getting the crap beat out of him
Punk, of course, is desperate to separate himself from the pro wrestling world that brought him fame and prove himself as a “legitimate” athlete, but he’ll never be able to truly put pro wrestling behind him. Punk is getting hit in the head a lot during sparring, because he’s still learning striking and striking defense. He’s also learning grappling, and takedown defense, and submission defense. It’s not going well, as you can see in this clip from his first sparring session (at Week 8 of his training!), where he gets tapped out twice, while looking incredibly sad and frustrated.