Sport and games

Motion detection
Sega Activator: IR motion detection
In 1993, Sega released the Sega Activator, a motion detection game controller designed to respond to a player's body movements, for their Genesis console. The Activator was based on the Light Harp, a MIDI controller invented by Assaf Gurner.
Like the Light Harp, the Activator is an octagonal frame that lies on the floor. Light-emitting diodes (LEDs) on the frame vertically project thin, invisible beams of infrared light. When something, such as a player's arm or leg, interrupts a beam, the device reads the distance at which the interruption occurred, and interprets the signal as a command. The device can also interpret signals from multiple beams simultaneously (i.e., chords) as a distinct command.
Sega designed especial Activator motions for a few of their own game releases. By tailoring motion signals specifically for a game, Sega attempted to provide a more intuitive gaming experience. A player could, for example, compete in Greatest Heavyweights of the Ring or Eternal Champions by miming punches.
Despite these efforts, the Activator was a commercial failure. Like the Power Glove of 1989, it was widely rejected for its "unwieldiness and inaccuracy".
Wii Remote: IR motion detection with accelerometry

Mario & Sonic at the Olympic Games (2007), a Wii game played by miming sports activity.
In 2006, Nintendo released Wii Sports, a sports game for the Wii console in which the player had to physically move their Wii Remote to move their avatar. The game contained five different sports—boxing, bowling, golf, tennis, and baseball—which could all be played individually or with multiple players. Players could also track their skill progress through the game, as they became more proficient at the different sports, and use the training mode to practice particular situations. As of 2013, Wii Sports became the second-highest selling video game of all time.
Wii Sports opened the way for other physically reactive sports-based video games, such as Mario & Sonic at the Olympic Games, the first official title to feature both Mario and Sonic the Hedgehog, in which players used the Wii Remote to simulate running, jumping and other Olympic sports. In 2008, Nintendo released Wii Fit, which allowed players to do aerobic and fitness exercises using the Wii Balance Board. In a similar light, 2008 saw the release of Mario Kart Wii, a racing game which allowed the player to use their remote with a Wii Wheel to act as a steering wheel, akin to those on traditional arcade racing games.