Take your spinning game to another level with Hydrofit's aquabikes. They offer a more intimate take on the fitness craze, with personal cabins that feature jacuzzi-style jets, flashing underwater lights, and an entertainment system. Apparently, trading land for H2O means less stress on the joints, plus the added pressure of the water speeds up blood circulation and helps you burn more fat. Tbh, though, we just like splashing around. £40 for 45 minutes. There's also a twin cabin room if you want to bike with a bud.