Ty wondered about his powers. What were the limits? Why did he suddenly gain them? And could he change... himself? Ty sat straight up in bed as he realized that he could quite literally change anything about himself that he hated. But would it work? He wasn't sure what to change. Overall, he didn't like his body in general, but he felt he should start with something small. His eyes lit up, "my height!" he whispered excitedly.
Ty stood 5'5" currently, which was short for a boy his age. But how much height should he gain? After some musing, he wished to grow a foot taller. Immediately, he felt a warm tingle spread throughout his body, and then his clothes seemed to feel tighter. He looked down and gasped as his pajama pants rode up higher and higher, exposing more of his legs. His pajama shirt was also riding higher and higher. Eventually the growth finished, and Ty stood at 6'5". His clothes looked comically small, even if Ty had only gained in height and was still fairly skinny.
But Ty could fix that! He wished to gain 50 pounds of muscle that would be evenly distributed throughout his frame, and watched as his frame slowly filled out, going from scrawny teen to normal teen to an athletic but not bodybuilder teen. He looked like he was a casual gym-goer or sports athlete, but not a serious weight trainer.