As soon as you entered the room the door slams closed behind you sealing you inside in darkness. You try to get it open but it doesn’t budge at all almost like someone is holding it closed on the other side. You panic for a bit, then remember the light you brought with you and turn it on. Briefly you think you see a flash of a fit woman standing in front of you with her hands on her hips, but as soon as you blink she is gone. You shake your head and rub your eyes a bit, you needed to get out of here.
Looking around the room for a bit trying to find a window or something. You figure out whomever this room belonged to was really into working out. Strewn across the floor are various barbells, a yoga mat, and some exercise VHS tapes that fell off a shelf full of them on the far side wall, as well as a few bits of clothing that reminded you this was a girls room. Along with an exercise bench, bed, and a few other pieces of fitness equipment all covered in a thick layer of dust. The walls had some more equipment hanging from it and posters of female body builders, many of which yellowed with age. But no sign of a window.
You pick up one of the dusty weights from the ground. Only to then start curling it involuntarily, you can’t let go of the weight. You put down your light to try and grab the dumbbell with your other hand and remove it, only to instead grab a second dumbbell automatically and repeat the motions. You watch in amazement as your arms gain more and more muscle mass before your eyes. You knew you should be freaking out by your body moving without your control. But the more you worked out the more relaxed you felt.
After a few reps you place the weights onto a shelf then automatically start doing some squats. You should be freaking out and indeed try and resist, but you felt more and more relaxed with each bend of the knees. Again you legs became more and more toned, you body working up a sweat. Invisible hands grab your pants and underwear, removing them. Your junk flopping about in the cold abandoned school air. As you went down you felt something cold cup your nuts. Like an ice cold hand pressing your genitals closer and closer to your crotch. Your balls and penis shrunk and eventually inverted. Your testicles flipping inside out and becoming ovaries, your penis going back and digging a tunnel inside of you to a fully functional womb. You let out a loud cry as the changes finished changing you from a he into a she.
After your done and feeling tired you lay on the yoga mat panting and out of breath. Then your sweat soaked shirt is yanked off as well and you feel your body suddenly start doing sit ups. You were too tired to resist, but somehow your body kept going like a machine on autopilot. With every sit up your belly became more and more toned. A six pack of abs materializing like mountains eroded by the rain. You also could see your smooth hairless crotch confirming what you felt. The same icy hands appeared and got to work on your chest muscles. Your nipples grew in size into areoles, a small bit of fat appearing behind them turning them into breast. Though calling them breasts was a bit generous, as if measured they would barely count as a cups and could be mistaken for pecks.
After your sit ups you grabbed a jump rope from the floor and immediately went into your next work out. By this point you put up no resistance what so ever. In fact it felt like you were the one doing the jump roping rather than an invisible force. While you jumped the last of your changes finalized. Your shoes and socks were taken away leaving your bare feet to slap onto the puddle of sweat you made on the yoga mat during your work out. All of your body hair evaporated leaving your skin smooth and glistening with sweat. Your shoulders rounded out and hips widened. Hair becoming a pixie cut and face becoming feminine, eyelashes lengthening, Adam’s apple melting way, lips filling out just slightly, and jaw and nose becoming sharper. Your muscular sweat covered covered body also gained a caramel colored tan with tan lines visible from a school swimsuit.
You finished your jump roping and sighed, stretching a bit and hearing the satisfying pops of your bones back into place. Nothing like a good workout in the nude to get your blood flowing. But now it was time to get dressed. Your closet slides open and an outfit comes flying out towards you…