Roller Derby

Roller derby is an intimidating sport. Its players skate around a track at high speeds, knocking each other down and racing to the finish. But it's also a great way to build muscle strength, agility and coordination while burning big-time calories! An hour of roller derby can burn between 400 and 1,000 calories.

"It's not just a workout," says Deborah Monterossa of the O.C. Roller Girls. "It is absolutely a full-blown lifestyle. I think going to the gym can be a lonely experience. You start thinking about yourself too much and how you look. In roller derby, there's so much camaraderie. There's a place for women of every size, and we can teach you how to skate."

OB/GYN Dr. Lisa Masterson, also known by her roller name "GYNOmite," goes for a spin with the O.C. Roller Girls, and has a blast!

Surf's Up

You no longer have to get wet to ride the waves. Find out how you can train to surf no matter where you live!

"That was so, so much fun," Dr. Lisa says. "It takes you back to when you were a kid roller skating up and down your grandma's driveway, and then you get a little bit on your wild side. I was Gynomiting and just feeling it!

"But the best part was the ladies," she continues. "The ladies were fantastic; they were just so much fun and nice. The sportswomanship that they had was great."

Dr. Lisa blogs about her roller derby experience!

• Dr. Sears shares his family fitness tips.

• Learn how to prevent sports injuries.