Wii FIT uses a unique platform peripheral called the Wii Balance Board that can measure a user's weight and their center of gravity, and calculate their body mass index when told the user's height. The game has about 40 different activities, including yoga poses, push ups, soccer, skiing, aerobics and many other games. Wii FIT lso allows its players to compare their fitness by using Wii FIT's own channel on the Wii Menu. The Wii FIT comes with the Wii balance board. The board is used for an extensive array of fun and dynamic activities, including aerobics, yoga, muscle stretches and games. Many of these activities focus towards providing a "core" workout, a popular exercise method that emphasizes slower, controlled motions. Wii FIT features four main categories to choose from: Strength Training, Aerobics, Yoga and Balance Games.