For almost a decade, boutique gyms have reigned supreme as the fitness industry moved away from multinational, traditional facilities towards a more bespoke approach. Customers have since been spoiled for choice in terms of exercise options, with classes becoming increasingly creative. Trampoline HIIT on Monday? Sure. Puppy Pilates on Wednesday? Why not.  Flexibility and diversity have become central principles of the industry and apps like ClassPass have flourished, offering people a multitude of experiences and