Life has changed so much for 2008 Olympic all-around gymnastics champion Nastia Liukin.

Wednesday, she got up early to work out in sweats. She then went to class at New York University, where she is a freshman studying sports management. She then got home and studied calculus.

And last night, she joined fellow Olympic champions Gabby Douglas and Torah Bright on the runway for the Heart Truth Red Dress Collection Fashion Show. The National Heart, Lung and Blood Institute established the Heart Truth and introduced the Red Dress in 2002 as the symbol of women and heart disease awareness.

"My life is so different these days," said the 23-year-old Liukin, who was born in Moscow. "I'm a freshman, and I have four years to figure things out. I love New York, though. There are so many possibilities."

Liukin wasn't going to pass up the chance to walk the runway with the likes of Kelly Osbourne, Jillian Michaels and the Jenner girls. Liukin, who previously designed leotards and sweats, has a new clothing line coming out soon. And the event Wednesday was promoting a good cause.

"It's really important that women exercise. I've had to incorporate that into my life after I left the sport," said Liukin, who along with Bright were representing Subway restaurants on the runway. "You can either choose to be healthy or not be healthy. I've chosen to try to stay healthy."

Bright, who won a snowboarding gold in the 2010 Winter Olympics in the halfpipe, agreed, saying that people should be aware. "We all have a choice of what we put in our bodies."

And Bright got the chance to dress up.

"I'm a girl. Of course, I love when they do my hair and makeup and I get to put on heels," said Bright, who previously had never walked a runway. "The only thing I was worried about was falling. Thankfully, I do know how to take a fall."