The first thing that changed was Jeff's clothes. The pajamas he was wearing had begun to morph and reform right before his eyes. They had turned into a beige jumpsuit. Wait, Jeff thought these clothes were familiar. Was he turning into a janitor? Admittedly, Jeff was a bit disappointed that he was turning into just a janitor, even if it made sense considering the pocket dimension was connected to the janitor's closet.
Jeff couldn't dwell on that fact for long as the changes to his body had started. First, his body began to stretch painfully until he was around 6'3. Then, to Jeff's surprise, his muscles began growing like crazy. He might have been a janitor, but it seems like he used the facilities as well. How big was he going to get? Was he going to get as big as a bodybuilder; he certainly was at least as buff as the gym bros around here. Jeff's new pecs seemed especially big with how much they were straining the front of his jumpsuit. Not that the rest of him was small, mind you. The jumpsuit seemed almost painted on his body and was not hiding how much muscle Jeff now possessed.
The last changes were occurring as the memories of this reality started to flood Jeff's mind. Jeff's face got older but also devastatingly handsome, and a short beard grew to complete his more mature and rugged look.
"Whoa!" That was all Jeff could say as he was given all the details of his new reality. Jeff was now 28 years old and had been a janitor and working out here for a few years. The pay wasn't great, but at least it allowed him to work out here without having to pay for the membership. Although it seems like, recently, the owner convinced him to become a personal trainer here instead. So Jeff was studying for his personal trainer license on the side.
This was an awesome new reality, Jeff thought. He was now a handsome and muscular janitor. Sure it wasn't the most glamorous job, but it was sure a nice change of pace from his old reality. Plus, the Jeff he had become was working to improve his life, so with a bit of effort, things would only get better.
Right now, Jeff's new body was itching for a workout. It would be a good excuse to explore this new reality too. Though maybe Jeff should experiment more with how the door works, though. So many choices and possibilities. It was a little overwhelming but exciting at the same time.