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Jackie Hesley, a certified Hoopnotica instructor who learned her moves at the Hoopnotica studio in Venice, Calif., has also lost about 50 pounds in six months."It is cardio and strength training because you're using all of your core muscles," Hesley told ABC NEWS. "You tighten up the sides of your body and you tighten up your center or your hips or your legs."Gabriella Redding started Hoopnotica because hooping seemed fun and healthy to her. After originally weighing 182 pounds, she's lost 50 pounds in a year thanks to exercise."You can burn up to 600 calories in an hour, moving your arms in and out and coming up," Redding said.And Osbourne isn't the only celebrity hooper. Michelle Obama, Catherine Zeta Jones, Jason Mraz and Beyonce also reportedly enjoy the exercise.Hooping burns an average of 420 calories per hour, which is the equivalent of a cardio-kickbox class.