This might be the worst thing I've ever written. Reread Fattyville or something, just steer clear of this mess.

Twilight Sparkle, perfect pony princess, has decided to get fit. She's been hearing about this great new invention, the 'treadmill', and decided to give it a try. A series of strange events follows.

Contains: Weight gain, farting, scat, transformation, mind rape, lactation, and anything else that pops into my head.
No relation to the Kanye West album.