Your Health: Can games like 'Wii Fit' really work it?

— -- Are Wii fit yet? As a nation, we definitely are not in good shape. But 10 months after the launch of Nintendo's Wii Fit— the first hit video game marketed as an exercise tool — there are signs that, with the help of gaming systems, some of us might be making progress.

In January and February, Wii Fit was the best-selling video game in the USA and had sold more than 6 million units, says market researcher NPD Group.

Think about it: A game that teaches yoga poses and calisthenics is outselling games that teach warfare and auto theft. Marketers have noticed. More "exergames" are in stores or on the way: The latest, Gold's Gym Cardio Workout (from Ubisoft, for Wii consoles), goes on sale Tuesday.

Fitness experts have noticed, too. Though no one says exergames will solve the nation's obesity problem, many hope they will produce real benefits.

"Some exercise is better than none," and "none" is what many people get, says Cedric Bryant, chief science officer of the American Council on Exercise.

People who use exergames certainly move. In Wii Fit, users are invited to try yoga, strength exercises, aerobic activities and balance games while stepping and gyrating on a movement-sensitive board and following an on-screen trainer. The game tells users they are toning their bodies, improving posture and balance and burning calories.

But how much good does it do?

The exercise council is conducting a study to find out. So are researchers at the University of Mississippi. They are lending the game to eight families for three months and recording the results, says Scott Owens, an associate professor of health and exercise science.

"I think that for people who have been inactive, there's a good chance they can see improvements," Owens says. And the game may inspire some to join real yoga classes or jog outside, Bryant adds.

Even hard-core athletes may find some use for such games, says Sue Stanley-Green, a professor of athletic training at Florida Southern College in Lakeland. She is trying Wii Fit as a rehabilitation tool for athletes who are recovering from surgery or injury.