Two women stand along the sideboards in a medium-size gym, watching their daughters skate in circles. Suddenly, a girl hits the floor. Hard. Quickly, she picks herself back up and sprints to catch up with the rest of the pack. As their girls skate laps, the women chat, their words barely audible over the yelling, laughter, and the click 'n' screech sounds of wheels abruptly stopping. "We need a sticker that says 'Derby Mom,'" says one mom in a punky knitting shirt. "Better than 'soccer mom,'" says the other mom with a wink. "I don't fit soccer mom criteria."