Women straddle and spin around ‘stripper’ poles, roll their bodies and flip their hair, following an instructor, who leads the class in a heart-pounding cardio workout. Pole dancing is not just for strippers anymore. New studios are appearing around Chicago, and more women are discovering pole dance as a way to express their sexuality, make new friends and get in shape.The Chronicle takes you inside the lessons at Flirty Girl Fitness, 1325 West Randolph Dr.