Flyball is a relay race for teams of four dogs. Dogs sprint over four hurdles. Then they jump against a spring-loaded box that releases a tennis ball, catch the ball midair and reverse course. After they race back through the hurdles, the next dog takes off. Full Story: http://news.statesmanjournal.com/article.cfm?i=84108 This flyball stuff looks like alot of fun. Anyone tried it?