Celebrity clients: Katie Holmes, Robert De Niro, Leonardo DiCaprio, George Clooney, Dennis Quaid, James Caan

Star status: More gentry than gym, even the old brick facade and stone-arched entrance of the 125-year-old club look ready to roll out the red carpet at a moment’s notice. And with regulars such as the Alouettes, the Canadiens and even Mitsou, they might as well leave it permanently unfurled. The revolving door of Hollywood celebs usually arrive with trainer in tow, says group fitness coordinator Shelly McDonald. Caan boxed. Quaid stuck to the treadmill (each with its own television screen). Clooney stayed sexy shooting hoops. And a pre-Cruise “beanpole” Holmes popped into several of McDonald’s Spinning classes. “She’s a total cardio freak. She’d be on the treadmill at least half an hour to an hour before and after Spinning,” says McDonald. A-list amenities include a bar and bistro, a pool, four dance studios and a staff of pros that include Olympic speed-skating medallist Nathalie Lambert and choreographers from Le Match des Étoiles, the French version of Dancing with the Stars.