" " Pickleball players use a paddle that's smaller than a tennis racquet but larger than a ping-pong paddle and bat a whiffle-type ball back and forth. RichLegg/Getty ImagesIf you've heard of "pickleball," chances are you associate the sport with seniors. That's not surprising, as it was the 55-plus set that began growing the paddle sport with the quirky name around the late 2000s. In 2018, the U.S. Open Pickleball Championships drew more than 2,100 competitors, according to Selkirk Sports, which manufactures pickleball paddles. Pickleball may even become an Olympic sport one day, especially if the International Federation of Pickleball (IFP) gets its way.