The Best Viral Video Workouts Of 2013

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Prancercise Joanna Rohrback's 1989 invention blew up this year, thanks to her amazing galloping, trotting and, of course, prancing. Harlem Shake Everyone from pro soccer teams to synchronized swimmers to HuffPost editors got in on the calorie-burning madness. Gangnam Style Psy's now-notorious "trot" has over 1 billion YouTube views worldwide, and even inspired a number of fitness classes to give his moves a try. Also on HuffPost: Loading Slideshow OK Go, 'Here It Goes Again' Interval workouts, sure. But <em>dance</em> workouts on the treadmill? Please, don't try this one at home! Watch the full video here. Madonna, 'Hung Up' Madge's arms usually get all the attention, but, hello, thighs! There aren't many people who would look this good in this tiny leotard -- and did we mention she's in her late 40s in this video! Also: Parkour! <br>Full story: http://www.huffingtonpost.com/2013/12/18/best-viral-video-workouts-2013_n_4461565.html