prancercise 25 years ago. it didn t start catching on until this week i think. reporter: when blogs featured the video, she had written a book and created a website. she describes prancercise as springy rhythmic movement forward, similar to a horse s gait, ideally induced by elation. reporter: she is he elated by the internet s sudden discovery of prancercise. on huffington post, her fitness routine is put on the humor page. the web can be harsh? i had take all of it, the goof, the laugh, but, hey, that s what getting famous is about. reporter: the lady has horse sense. four modes of prancercise, most of them done wearing ankle weights. we ll really cut the noose and let it loose with the