[tfandango]

I recently completed a year long effort to convince my employer to deploy standing desks (turned out to be VariDesks). We must have hundreds of them now and many people are standing and love them.

The general concensus (currently) seems to be that 8 hours of sitting (read not ever moving around) is bad for you whether you excercise or not. I would think an under-desk bike like you describe would also be effective in remedying the problems caused by sedentary work. I'm thinking about adding a balance board like someone else here suggested.