The gym’s star trainer is Adam Booth, the Brit who has trained top-flight boxers David Haye, Andy Lee and Ryan Burnett to world championship titles. Classes focus meticulously on the constituent elements that make a boxer float like a butterfly and sting like a bee: agility, footwork, technique. One class, pitched at advanced boxers, titled Anatomy of a Fight, involves viewing a bout between two greats, projected onto the wall of the studio, in order to learn how to box like a champion. The idea is not to think about sessions as a workout but as coaching: basically, like you’re an amateur sportsman.