Breast stroke

A brunette, a redhead and a blonde are in a breast stroke race. The starter's gun goes off and the three girls dive into the pool. The brunette and the redhead shoot across the pool and get out. 20 minutes later the blonde reaches the end and gets out. The judge says, "The gold medal goes to the brunette, the silver medal goes to the redhead, and the bronze goes to the blonde." The blonde says, "I don't want to be a sore loser, but I think the other girls were using their arms."