You find yourself in a well lit room that was square in shape. The room was sliver. And the only note worthy thing was a large mirror on the wall. Other than that, there was nothing. No doors. No windows. No escape

This room is disconnected from the rest of reality. And therefore, the rules of reality do not apply here. You can alter yourself and do whatever you want. You can stretch, flatten, and inflate yourself freely with no pain or realism

What do you do?