Throughout her 15 years as a certified personal trainer, Karyn Graham has earned an unusual nickname: “The Butt Queen.” The moniker references her signature workout, the Karyn Technique, which firms glute muscles without bulking up thighs. Karyn teaches her eponymous classes at RPM Fitness Studio, a boutique workout venue she co-owns with her sister, Cynthia. The duo finesses clients’ physiques with rigorous spinning classes, whose minimal joint impact renders them ideal for injured athletes and knee models. Complementary Pilates classes, conducted on mats or Reformers, streamline physiques by building long, lean muscle. Five-week Slimfit Bootcamps fuse Pilates with cardio-kick, boxing, body-fat analysis, and nutrition counseling.