embellish the image of violence or machismo. However, some skaters say the sport is reasonably safe if skaters take precautions. The rules require appropriate medical professionals on-site at every bout, even if not required by laws or arena regulations. The WFTDA offers insurance for leagues in the United States with legal liability and accident coverage, but it recommends that skaters also carry their own primary medical insurance. Expansion Although the early 2000s revival of roller derby was initially all-female, some leagues later introduced all-male teams and all-gender games; there were over 140 junior roller derby programs in the United States, and many more around the world. College roller derby is also expanding in the United States. The University of Arizona's Derby Cats describe themselves as the first-ever official college flat-track roller derby team. The first intercollegiate derby bout took place on March 3, 2018, when the Claremont Colleges roller derby team defeated Arizona State University. The website FlatTrackStats compiles ratings of WFTDA teams, adjusting them after every bout based on how the actual score compares to the predicted score. The WFTDA's own Stats Repository has comparable information and often is updated at halftime of a bout. Roller derby bouts are now streamed online, and there are archived videos of past bouts and tournaments. The WFTDA offers live streaming video of its tournaments at wftda.tv. Derby News Network offered live streaming video and archived video including events outside the WFTDA. FiveOnFive magazine covers roller derby and diverse aspects such as business, training, junior roller derby, and nutrition. Governance and organization The largest governing body for the sport is the Women's Flat Track Derby Association (WFTDA), with 397 full member leagues and 48 apprentice leagues. WFTDA membership is a major goal of aspiring leagues. Other associations support either coed or men-only derby; the largest organization supporting male roller derby is the Men's Roller Derby Association (MRDA). Within the United States, the Junior Roller Derby Association governs play by those under 18. It modifies the WFTDA rules for minors, such as prohibiting hitting and accelerating into a block. Some U.S. leagues decline affiliation with a national organization because they prefer local governance. USA Roller Sports (USARS) is recognized by the International Roller Sports Federation (FIRS) and the United States Olympic Committee (USOC) as the National Governing Body of competitive roller sports in the United States, including speed, figure, hockey, roller derby and slalom.