Olympians Apolo Ohno, Lolo Jones guest star on 'Biggest Loser'

USA Bobsled team member Jasmine Fenlator, and USA Curling team members Jessica Schultz, Debbie McCormick and Anne Swisshelm also guest star in Olympic-themed episode

"The Biggest Loser" contestants are off on the adventure of a lifetime in a special Winter Olympic-themed episode, where they'll train like champions at Utah Olympic Park and meet Olympic athletes Apolo Ohno (an eight-time medalist) and Lolo Jones. The special episode airs Tuesday, Jan. 14 (8 p.m.), on NBC.

After arriving at Utah's Olympic park, trainer Dolvett Quince introduces the players to Ohno, who talks about his own "Second Chance" - this season's theme - and works out with the contestants inside the Olympic Oval arena. Then, the contestants get to compete in the sport of curling, after an introduction to USA Curling team members Jessica Schultz, Debbie McCormick and Anne Swisshelm. 

The fun continues at the base of the bobsled track, where words of motivation from USA Bobsled team members Lolo Jones and Jazmine Fenlator get the remaining eight players fired up about the fast-paced sport.

But for this week's challenge, they won't be racing down the track. Instead, they will be running more than a mile up the bobsled track, a challenge made far more difficult by the elevation of more than 7,000 feet. 

Also this week, trainer Bob Harper designs an Olympic-inspired workout that puts all the players to the test, and trainer Jillian Michaels tries to help a contestant still struggling to embrace her self-worth.

Travelling and being away from the ranch environment leaves many contestants worried about their weight loss this week. Those fears intensify at the weigh-in, where shocking results push two players below the yellow line. The other contestants must decide which player is going home.

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