Do you long for the days when roller derbies ruled? Then check out these area leagues:
* Philly Roller Girls - a flat-track league, including the all-star Liberty Belles. Tryouts for next season are Sunday at Millennium Skate World, in Camden. www.phillyrollergirls.com.
* Penn Jersey Roller Derby - a co-ed league that rolls on banked and flat tracks. They practice in North Philly at 18th Street and Indiana Avenue. pennjerseyrollerderby.com