London has some of the world’s toughest classes on offer, with top trainers like Tracy Anderson (who has worked as PT to celebrities from Gwyneth Paltrow to Jennifer Lopez) opening up studios, and increasing boutique offerings, such as the soon-to-open The Method in Notting Hill. There’s something for everyone from dance classes to strength training, tech-motivated score boards to military-inspired workouts. But don’t forget: a tough session doesn’t always have to complicated or fancy. Here are the ones we think are the most hardcore in the capital:
