Bike your way to better health in 2014 Spin instructor Audrey Allison, right, yells to be heard over the loud music during the Caffeinated Rock-n-Spin class Thursday at the J.A. Walters YMCA in Gainesville. On average, Allison has about six to eight students in the morning class. The Rock-n-Spin class meets three times a week on Tuesday, Wednesday and Thursday mornings. - photo by Photos by NAT GURLEY "You will exercise at least 30 minutes a day," the doctor said following a physical exam last month. Then she added those dreaded words. "Women your age" have to exercise or else gain weight.