East River Pilates East River Pilates is a boutique fitness studio located in the heart of Williamsburg. Specializing in athletic, technical, feel-good workouts for total body conditioning, our Brooklyn based Pilates studio offers over 100 classes every week at affordable rates, including; Mat Pilates, Reformer Pilates, Prenatal Pilates with BodyLove Pilates, Yoga + Core, Cardio + Condition, Stretch + Lengthen, Dance with Jules, and West African Dance. In 2016, WMagazine rated East River Pilates as number one in their Summer''s Best Workouts guide.