"Yeah," replied Jason, "now that I'm getting big, time for a big guy's sport!"
"Why not?" the guy replied, "there's room for you to join the team and grow with us!"
"If you want to scrimmage, fall in!" called out of the coaches, and Jason then started to tag along behind the guy he'd just encountered. Running up and down the field with the football team, sprinting, then jogging, was initially exhilertating but Jason rapidly ran out of 'puff'. Not being accustomed to so much exertion, let alone at his new size, he soon felt winded. Panting hard, he also felt his leg muscles hurting.
"Here, this will help," said one of his new teammates, passing him a pair of capsules. He popped this strange medicine, and within minutes felt better. As he got his breath back, his legs stopped hurting so much, too, and the running didn't seem as hard, and his panting seemed less.
At the end of the practice, in the showers, he noticed that he actually seemed thinner, except for his legs, which seemed bigger. "Gotta be illusion, nobody changes that fast," Jason thought.
He didn't know that the medicine was meant to speed the changes in his body.
Or that his body had responded really strongly to the medicine. It had really flattened him out.
Looking at himself in the locker room, Jason thinks he is too thin.