(CBS) – A Naperville woman went from overweight to overjoyed.

She shows CBS 2’s Mary Kay Kleist how she dropped 70 pounds and eight dress sizes.

In 2010, Brooke Tetik weighed close to 200 pounds.

“My blood pressure was high, and I had stage 3 fatty liver disease. That was a wakeup call like, you’re either going to go another level of obesity, or you’re just going to have to get your life back,” she says.

She decided to get her life back.

She made it her New Year’s resolution for 2011 to get healthy.  The first steps were not easy.

“I got on the treadmill, and I thought I’ll just run. I just want to run five minutes.’ I had this 10-year-old that was telling me, ‘You can do it, mom,’” she says. “And that year I ran the half Chicago Marathon,” Tetik says.

She lost about 50 pounds that year running, doing yoga and counting calories.

“And around Christmas 2011, I got into the weight room, which was awesome. And I changed the amount of food and what I was eating.  So I was eating more lean protein, complex carbohydrates, healthy fats versus things out of a package,” Tetik says.

She now teaches yoga and has become a personal trainer.

“I dumped my old body, and I traded it in for a healthy body, a healthy mind,” she says.

She’s feeling good about turning 40. By working out five days a week, she’s 70 pounds lighter and went from a size 16 to a zero.

She even placed second in a physique competition in July 2012.

“I never thought that I’d be on a bikini stage, with 20-year-olds, and showing my progress that way,” she says. “I feel awesome. I feel healthy. I feel happy. And I feel comfortable in my own body.”

Brooke Tetik is now training to compete in another physique competition and she has opened her own yoga studio.