Wii Fit

Wii Fit is an exercise video game made by Nintendo for the Wii video game console.
Two sequels were released for the game. Wii Fit Plus was released for the Wii in 2009. Wii Fit U was released for the Wii U in 2014.
Gameplay.
The game requires players to use an object called the Wii Balance Board to play. There are many different exercises and games. These are split into four categories - yoga, strength training, aerobics, and balance games.
The Yoga and Strength Training modes have a character called the Wii Fit Trainer. This character guides the players through the exercises. The player can choose between a male or a female trainer. 
They were later added to Super Smash Bros. for Nintendo 3DS and Wii U and Super Smash Bros. Ultimate, as a fighter in those games.
Development.
The game was released in Japan on December 1, 2007.