Wii Menu
Players may undergo "Body Tests," in which the player's body mass index (BMI) is calculated and balance control is tested. Each Body Test determines and updates the player's "Wii Fit Age", which loosely suggests the player's physical strength in relation to his or her true age. A standalone application called "Wii Fit Channel" may be installed to the Wii Menu in order for players to perform Body Tests without needing to load the "Wii Fit" game disc.