MTV.com (blog)'Zumba Fitness World Party' preview: Total Globetrotting WorkoutMTV.com (blog)Compared to the cardio and fitness focus of last year's 'Zumba Fitness Core', the Zumba series' 2013 offering, 'Zumba Fitness World Party' feels like the franchise's opportunity to stretch its legs beyond the familiar core workouts and fitness. While ...