Reporter: She's a sensation on the slopes. There is just something so like magical about being in the snow and being free. Reporter: Now 34-year-old world class snowboarder Amy Purdy is trading in her... See More
Reporter: She's a sensation on the slopes. There is just something so like magical about being in the snow and being free. Reporter: Now 34-year-old world class snowboarder Amy Purdy is trading in her snowboard for dancing shoes. Good. Reporter: Setting her sights on winning a mirrorball trophy as a contest apartment on "Dancing with the stars." I can dance. Yes. Reporter: She's teaming up with five-time "Dancing with the stars" champion Derek hough. What are you most excited about? I'm excited about the dancing, of course. Music, the costumes. Reporter: But Purdy is different from past dancers. Two, three. Cha, cha, cha. Reporter: She's been a double amputee since the age of 19. Losing her legs after she was hit by a near fatal case of bacterial meningitis. Purdy and her mother talked about those dark days in P & G's "Raising an olympian"? She's struck down so quickly in an actual horrific way. In a coma for nearly three weeks she was given a less than 2% chance to live. I remember thinking this is surreal. So crazy. I thought this is what it feels like to die. Reporter: But she pulled through. Using her love of snowboarding as motivation to learn to walk again. I never even questioned if I would do it again. Reporter: And she did. Just two years later, the double empty was competing again, even making it to the paralympic games in sochi beginning next week. Very little time to rehearse and before the show airs so the odds are stacked against us but if there's anybody that defies the odds, it's her. Reporter: When she comes back she'll have her eye on the grandest dance prize of all. What are you most nervous about on the show? You know, I'm not really that nervous. No. I'm just excited. Whatever nerves I have I'm turning into excitement. Amy Purdy, Derek hough, we're out. So she has running legs and walking legs and now they're in the process of developing some dancing legs for Purdy. She won't have long to get used to them but she has overcome much more and I would say she has a lot to dance about.haareat story. She is my all-time favorite cast member already. That is a remarkable -- Without even stepping on the dance Noor. Without even dancing. Derek is so excited talking to him yesterday. He is saying bring it on. I think they're going to be great. My favorite. We'll see it all. It all kicks off "Dancing with the stars" Monday, March 17th right here on ABC.
This transcript has been automatically generated and may not be 100% accurate.