Katy Perry got fit for her tour by developing a meal plan that allowed for occasional indulgences. “On Sundays, I get to have a cheat day where I go buck wild and eat In-N-Out burger,” she said, adding that she isn’t allowed to hang out in front of the TV afterward. “Then I’ll go work out.”
Rock-Star Abs Of Grammy Favorites
Find out how these performers train to flaunt belly-baring fashion.