Wii Fit

Wii Fit​ (Wiiフィット) is a fitness video game developed by Nintendo for the Wii. The game introduced the Wii Balance Board, which the game uses to measure the player's weight and posture as they stand on it during exercise. Matsunaga described the game as a "way to help get families exercising together", and features a wide variety of exercises such as yoga, strength training, aerobics, and balance games. It has proven so successful at creating entertaining exercise, that it has been adopted by health clubs, nursing homes and even used for professional physiotherapy rehabilitation.

Channel Installation Functionality
The game will ask you to install a Wii Fit Plus channel on the Wii Menu at some point. You can go through the process and it will install and return to the game successfully. The system menu will not actually have the Wii Fit Plus channel, though.