Idea factory: Cubicles effect exercise machine

How many hours do we spend in front of the comp at work, where are fingers are definitely doing their bit but the rest of our body is at rest. Hence i thought of this simple exercise machine..it could be like 2 pedals that you push down on (not like cycle pedals but more like paddle boat pedals). And you can keep track of your progress in many ways. One way i envision is a reward system. On the rowing machine, this usually takes the form of you blowing air on yourself. At work, it could be a meter showing you your current speed and calories burnt, power spent or even better, you let it know how many calories you'd like to burn to earn your next treat like a bag of chips and it lets you know how much further you have! Maybe such a machine exists? If so, add what you know in the comments section. As always, I have too many ideas but not enough motivation to start working on them and take them through to fruition. So if you are really interested in something and would like to collaborate, give me a holler and we can sit down to discuss about it. Remember..1% inspiration, 99% perspiration.