One world record was broken and another tied Friday at the 2008 U.S. Olympic Swimming Team Trials. Aaron Peirsol tied the world record and qualified in the men's 200m back, turning in a time of 1:54.32, and Michael Phelps broke his own world record and added the 200m IM to his Olympic program with a time of 1:54.80. For Phelps, the 200m IM was his fourth win of the week, after taking the 400m IM, the 200m free and the 200m fly. He has qualified for the Olympics in five events, including the 4x200m free relay. (Photo of Dara Torres by Jamie Squire/Getty Images)

Once called water ballet, it is moving through the water with intricate maneuvers, synchronized with other swimmers and with music. Synchronized Swimming, a women's only sport at the Olympic level, was an exhibition sport at the Olympic Games from 1948 to 1968, then became a full-fledged Summer Olympic sport in 1984. At the 1984, 1988, and 1992 games there were solo and duet events. In 1996, only a team event was held. Since 2000, a team event and a duet event has been held.