Ah unfortunately it isn't, I did check though and thankyou for the lead.
From what I remember the inflatee in the story has implants and is howing off in the gym being rude to the other women and one decides to curse her, and ends up making it a challenge where the inflatee will keep on growing unless she can complete her excersise sets
Are you talking about "Watch the Temper?" This is about a woman who inflates in a gym but I'm not sure about exercising off the inflation. She explodes at the end. -- Oliver