Nathalie, in a sports bra and tiny shorts, commands a room full of eager women in a private, high-intensity cardio session. She sets the pace, her hips gyrating in perfect rhythm, as the group twerks, squats, and bridges to the pulsating music. The air grows thick with heat and the scent of aroused women, their bodies pressed together in shared exertion, as Nathalie encourages them to push harder, to "bouge ton boule" and feel the burn.