Take that, body fat!

NO one is suggesting that flailing around the living room while playing a video game will turn a chunky channel surfer into an Ironman, but some dedicated Nintendo Wii users believe that playing the sports games bundled with the system is helping them slim down.

Here's how it works. Wielding a wireless remote like a piece of sporting equipment -- such as a tennis racket, baseball bat or golf club -- players control TV depictions of themselves participating in various sports. In the process, they work their biceps, shoulders, core and even the legs.

All of this, of course, happens in the comfort and privacy of the living room or rec room, which means users of any age or skill level can hit the virtual court, diamond or links anytime.

Since its Nov. 19 release, the Wii has become a mini-phenom -- 1.5 million of the consoles were snapped up by U.S. consumers between the product's launch and the end of January, according to market researcher NPD Group Inc. The lightning liftoff has made the Wii the fastest-selling console in the video game industry in the last 10 years.

Wii has attracted a devoted (some would say rabid) following, including 26-year-old Mickey DeLorenzo of South Philadelphia. The multimedia developer quickly attained cultural hero status by blogging the results of his 30-minute-a-day Wii exercise regimen.

DeLorenzo, who lost 9 pounds between Dec. 3 and Jan. 15 just by playing Wii games, says he's been so busy keeping up with media interviews he's neglected his Wii exercise regimen. (He's gained back a pound.)

"I've been fielding hundreds of e-mails from Wii users who want to know how I did it," he says. "I even have a literary agent now."

Traineo.com, a Web-based exercise community, has also hopped on board. The free site -- essentially an online support group of 50,000 fitness buffs and dieters -- recently launched a special area for Wii enthusiasts to meet online and trade Wii-related fitness tips.

In a few short weeks, membership in the Wii group has swelled to nearly 1,000 members.

"We're seeing a huge number of people interested in using the Wii as a fitness tool," says Traineo.com Chief Executive Alasdair McLean-Foreman. "They're discussing which games burn the most calories, experimenting with wrist weights and logging their workouts online," he says.

To the degree that the user is actually moving around, the system probably is conferring some benefits, scientists say.