When we heard that Madonna was launching a workout series called "Addicted to Sweat," our reaction was "sign us up!" We've long admired the pop superstar's svelte physique.
But, of course, those wanting to feel the burn along with a celebrity can take their pick. An unlikely array of stars -- Angela Lansbury, Zsa Zsa Gabor and Mark Wahlberg among them -- have released exercise videos.
Here are some of our favorites.