8. JULIANNE HOUGH

Fitness videos: Dance With Julianne: Cardio Ballroom (2009), Dance with Julianne: Just Dance! (2010)

Man, it doesn’t get much more girl-next-door than Julianne Hough. The country singer and two-time Dancing With The Stars winner just glows with cheer, giddiness, and all that silly sweet shit. Even though we got a lot of love for Hough, we have to admit that her workout DVDs are kind of a fail. We can't imagine too many couch potatoes keeping up with her movies without breaking their necks.