It tones your hips and waist, it burns 600 calories an hour and on a scale of sport to fun it's full smile territory. And just in case you're still not sold on hula-hooping, this cheerful fitness class takes place next to the rooftop pool at the Berkeley Health Club and Spa, meaning your work out comes with additional fresh air and all-star views. Hoop experts HulaFit will teach techniques such as 'The Vortex' and 'Booty Bump' in order to work every last bit of your body without it feeling like a chore. Participants will tuck into a poolside lunch after the class, and are welcome to have a swim, too. Book in advance on 020 7201 1699 or by emailing firstname.lastname@example.org.