Talk about old school. In skating rinks around the nation, saucy dames are getting together and strapping on old-fashioned quad rolĀler skates to jam, block, and pummel each other. The roller derby revival is on. More than two dozen leagues operate across the country, with an average of 30 to 40 active skaters each (some leagues even boast as many as 60), and many more are in the works.