Major muscle groups get a makeover at this Marina outpost for the trendy ballet-influenced exercise technique.. In Short At this pristine fitness studio, practitioners line up in front of stationary bars much like those used in traditional ballet to perform movements focused on creating tight bums, flat tummies and long, lean muscles in the arms and legs. A hit with moms-to-be, the workout combines intervals of low-impact cardio with strength training and deep stretching. Three instruction rooms accommodate numerous daily classes, including those tailored to prenatal and 50-plus clients. Onsite massage therapy is available by appointment.