This excercise is a yoga teaching computer game, using something like an xbox connect or nintendo wii. there are two screens, one is a status report screen, which shows the pose you have to do, next to a video image of yourself with instructions as to how to do the pose. The voiceover tells you exactly what to do. When it tells you to start the pose, the voiceover will give you timing of your pose (hold for five seconds, breathe in, five four three two one, out five four three two one) and on the screen, you will also see the timers ticking down (for the poses in which you are facing forward and can actually see the screen).

Most of the directions from the computer would be given by a voiceover, because of the difficulty in watching the screen. So you have an opening screen with diagrams of the poses you should use, and then when you start getting into the poses, you still have audio telling you what you are doing right and wrong, and also in the audio you will have the timing for each of the poses, and how long you should breathe for. If you have gotten a pose too badly wrong, there will be a gentle voice warning you that you are getting it wrong.

Once the pose is completed (successfully or unsuccessfully), you will see a screen of your pose, and the pose you were aiming for. If you got the pose wrong, the areas of your body you got wrong will be highlighted in red.

Scores out of 100% would be given for timing, posture and breathing, breathing being measured by sensors on the body or maybe using voice recognition.
INTERACTIVITY
This is highly interactive, the computer is constantly updating and giving feedback on how you are doing, in real time, particularly with timing of the poses, and the exact posture you are using, both in real time (although this information is only usable in poses where you are facing forward) and after the event (useful for poses where you are not facing the screen).

The interface would be controlled by the posture of the player, as well as the breathing of the player. Data on posture  may also be provided by sensors in the yoga mat.