Add another device to the growing list of fitness video accessories like Wii Fit's Balance Board, EA Sports Active's pouch strap, and the proposed Wii pedal controller: Tellart's Yoga Game Ball.

While the setup uses a computer instead of a Wii console, it requires that users attach a Wii Remote to a velcro patch on an exercise ball. Players sit on the ball, and the controller tracks how it's tilted while sending that data to an application that translates those movements for different games.

Users can also control the Yoga Game Ball while posed in alternative positions, such as lying on the ground with their feet on the ball. More complex games that require button presses use a second Wii Remote that players hold in their hand.

The games demonstrated in this video include freeware clones of Tetris, Asteroids, and Pac-Man -- one of the speakers mentions that they originally used the device with MAME but then abandoned that idea due to licensing issues.

Tellart, a company specializing in interactive prototypes that "address human need and shape human experience", created this prototype as part of an office demonstration for health insurance company Humana with the goal of "integrating some sort of physical activity as a means to control video games".

The studio showed off other prototypes at Humana, including this setup that shows Wii Remotes simulating and tracking a jump-rope exercise:

Tellart also had a prototype for an interactive installation called Heartbeat Orchestra, which senses multiple players' heart rates, and creates a song based on that information. The company says it's designed to get people "excited about checking their biometrics more often". You can watch the demonstration for that here.