GRAND JUNCTION, Colo. - Roller derby is the fastest-growing and most misunderstood sport in the world, according to the Grand Junction Roller Girls, a skater owned and operated flat-track roller derby league. The Roller Girls are looking to educate the public and possibly recruit new skaters at a documentary showing of "Derby Baby" Saturday, March 23, at the Grand Junction Armory Readiness Center, 2820 Riverside Parkway."Our goal is to inspire woman to be bold and try something new," stated a news release regarding the documentary. "We not only hope to use this as a great recruiting tool, but as an opportunity to teach others what the sport is all about."Girls must be 18 or older to join.The Grand Junction Roller Girls formed in the Grand Valley in 2010. The group belongs to the women's flat-track derby association apprentice program, with the intention of becoming a full member league.The Roller Girls league meets twice a week to skate: Sundays from 2-4 p.m. outside at Canyon View Park, and Wednesdays, 6:30-8:30 p.m., at the Lincoln Park Barn. There are 21 members.The 96-minute documentary, produced by Robin Bond and Dave Wruck, and narrated by actress Juliette Lewis, "covers every aspect of roller derby," skating coach Amber DeBoer said. Doors open at 3 p.m., and the film showing is at 4. There will be a raffle at the event, concessions and merchandise for sale. Plus, all of the Grand Junction Roller Girls will be present to answer questions, DeBoer said.