Wii Fit

Wii Fit requires the use of the Wii Balance Board, a unique platform peripheral that the player stands upon during play. Similar to a bathroom scale, the Wii Balance Board is capable of measuring a person's weight, but is also able to detect the person's center of balance (COB), a feature heavily utilized in the game. Wii Fit contains more than 40 activities designed to engage the player in physical exercise, which consist of yoga, strength training, aerobics, and balance games. (wikipedia.org)