DALLAS (UPI) -- A 22-year-old Dallas college student has set a world record by juggling three tennis balls for more than 12 hours without stopping.

David Slick, a student at Dallas Baptist University, juggled the tennis balls for 12 hours, 12 minutes and 12 seconds, besting the previous record of 11 hours and four minutes, the Fort Worth (Texas) Star-Telegram reported.

"I knew I could do it. I knew it would be hard. But I knew it would be worth it," he said.

Slick, whose name will be printed in the "Juggling Three Objects Nonstop" category of the Guinness Book of World Records, said he practiced in his dorm room for his record attempt.

"You wouldn't believe how sore you could get just throwing some tennis balls up in the air," he said.