Doctors say one of the best ways to fight cancer is with exercise, and a growing number of people are surviving because of better treatments.

Carol Fee, 74, is full of energy, teaching a Zumba class in Haverford, Pennsylvania.

"When you're dancing, there's nothing else in your head except the dancing," she said. "All of your life's problems are left at the door."

Fee decided to become a Zumba instructor after she was diagnosed with breast cancer 12 years ago.

"It was just a really scary time," Fee said.

After surviving surgery, radiation and chemo, Fee is now supporting other women in the class who've had breast cancer.

"It makes me alive again," Stacy Forman, a breast cancer patient, said. "I feel really comfortable, like dancing with these women."

Exercise is known to reduce the r

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