Engineering TV

I like this idea of what you are trying to prevent in bone loss in outer space.  However, we already have a system of creating artificial G forces.  We call it centrifugal motion forces.  Why doen't NASA utilize that principal for a spinning top type of space station to solve this requirement for prolonged space stays?  This might also solve some of the positioning problems of stability.  I just don't understand why this approach has not been used or even tried to my knowledge?

considering the effects of angular momentum with respect to the calculations of a stable orbit, is the concept of an exercise gym necessary for the relative time period?

awesome!