Adam Gentz knew Donny Osmond would win the "Dancing With the Stars" competition Tuesday night.

After all, the University of Wisconsin-La Crosse graduate trained the former teen pop star for the show.

Gentz, who now works in Las Vegas, said he prepared Osmond for the competition like a professional athlete, and the 51-year-old singer was in great shape for the TV show.

"I would have been shocked if anyone else had won the competition," Gentz said. "I told everybody Donny was going to win before the show started, but people looked at me funny.

"He has a great work ethic, and I knew with his training and natural showmanship he would get the most votes," he said.

Gentz said he used the knowledge from his UW-L education to work with Osmond on core strength, speed, agility and explosive foot work.

"I was a motivational tool, and he was 100 percent on board with it," Gentz said.

The native of Remsen, Iowa, received his master's degree in human performance from UW-L in 1998.

"I thought La Crosse was one of the best experiences of my life," he said.

He became head athletic trainer at Green Valley High School in Las Vegas while working on the side as a personal trainer. One client was Gamal Aziz, now president of MGM Grand Hotel in Las Vegas.

Gentz started his own fitness business after gaining other hotel executives as clients, including Don Marrandino who runs the Flamingo Hotel where Osmond and his sister, Marie, opened their Vegas show a year ago.

"Don liked how he looked and felt after working with me, so he wanted me to hook up with Donny Osmond to keep him in shape for all the Flamingo shows," Gentz said.

Gentz became Osmond's regular trainer and stepped up his training for "Dancing With the Stars."

He said Osmond, who is 5 feet 9 inches tall, lost about 10 pounds and his body fat decreased from 17 percent to 12 percent during training.

Gentz now runs a state-of-the-art sports performance center, Strength Center Las Vegas.

He said he will continue to be Osmond's trainer because he and his sister recently extended their Vegas show for another two years.

"I didn't expect to be a personal trainer for gaming executives and Vegas celebrities, but it's been a lot of fun," Gentz said.