David Brinkerhoff was a wallflower at high-school dances. Now the UC Davis senior is anything but -- performing choreographed dance and aerial moves before audiences that have numbered in the thousands. As co-founder of the Hepcats Swing Club at Davis and its 10-member performance team, he is part of the swing dancing craze that has swept campuses across the country. "It's an addiction," says Brinkerhoff of Antioch, who is majoring in agricultural systems and the environment. Introduced to swing in 1997, he helped establish the campus club about 18 months ago. It now has 150 members drawn from campus and beyond, offers lessons and hosts dances Tuesday nights at a local studio. With an increasing number of requests for dancers to perform at campus and other events, the club established a performance team six months ago. Brinkerhoff says the 10 members, who practice and social dance about 20 hours a week, count a half-time show for the Monarchs professional basketball team among the highlights of their performances in the Sacramento and San Francisco areas. Members of the Hepcats team say they love the music, the physical exercise and sociability of swing dance. And they consider themselves enthusiastic ambassadors of the dance. "We want to recruit people and get them onto the floor," Brinkerhoff says.