Nintendo’s "Wii Fit" exercise game debuted in the U.S. on Monday. The Wii console and its interactive video games have been hugely popular since its initial launch, and the Wii Fit is a smart way to exercise and have fun, not just a gaming console.  The video game retails for US$90 (assuming one already has the Wii controller) and includes a balance board that is shoulder-wide.  The balance board senses changes in posture and customizes the gaming experience as a result.

The Wii Fit includes more than 40 activities in four categories, including strength training, aerobics, balance and yoga. It also can track its users' Body Mass Index (BMI) as well as body weight and maintain progress charts of fitness, and offer fitness tips. Nintendo’s intent with the Wii Fit is to reach out to couch potatoes and others who have not played video games before and those who do not routinely exercise, including some older folks and middle-aged women.

Some analysts have predicted that the Wii Fit will only be limited as to how many units Nintendo can produce, and predict that at least 30 percent of the 10 million current Wii owners in the U.S. will also purchase the Wii Fit. According to Wal-Mart and Amazon’s Web sites, both have indicated that they have already sold their allotment of pre-orders for the Wii Fit and the game is out of stock.  Nintendo stated that in the month of April alone it sold more than 700,000 Wii consoles in the U.S.

Over 2 million copies of "Wii Fit" have been sold in Japan, and the video game has just been released for sale in Europe.

Current the Wii Fit is only available at Nintendo’s New York City store, but general sales of the product will begin at U.S. retailers across the country on Wednesday of this week.