Jon found 'himself' watching the busty instructor from a new point of view. 'He' looked down and saw that his assumption were correct, he was now another busty female in with the crowd. But these stretches actually felt very relaxing, so she shrugged it off for the time being and did them.
After a few exercises, the lesson was over. Her breasts did get in the way for a couple attempts of some.
"Whew, those actaully made me work up a sweat. Man, I wish this tank-top had midriff..."
And of course, in a few seconds it did, revealing her nice flat stomach and curvy waist.
A cold breeze then went through her body, causing her already poking nipples to become fully hardened, now showing through her top even more.
"This is pretty annoying, maybe I should've kept bra's... Oh well. How about I wish that every girl in this gym's nipples were hard."
Instantly he saw them poking through more and more of the girls' shirts.
1'I wish that whenever a girl from this gym is alone with a guy other than family, she will become very, very horny and after 2 minutes of not having sexual relief, they will become more and more of a bimbo, with those effects being permanent."
Now all Jon had to do was to word a wish that made her male again.
