You shouldn't make up medical ailments you don't have.
Pat hates baseball which is what they are learning in his gym class.
Pat wants to avoid playing the game.
Pat explains to the teacher that he hates baseball, and would rather play something different, but the teacher convinces him that it's fun once you learn.
Pat tells the teacher he has asthma, but he doesn't believe him.
It turns out that Pat really enjoys the game is happy that he gave it a chance.
The teacher calls Pat's mom, who lit isn't true, and then Pat gets in trouble when he goes home.