Today, the Zumba Twinz hit up London with their high energy dancing and party atmosphere. Having fun makes you forget you're even exercising and gives a nice twist to the usual Jane Fonda-eqsue aerobic moves. The Twinz are joined by Craig Addison, founder of Zumba Riot, and Natalia Varela, International Latin Presenter. Legwarmers optional. General admission. Over 16s only. Dress code: fitness wear and trainers.