Move It or Lose It!
Fortunately, I have always been very active and it pays in many ways. Although I sit for up to 6 or more hours at my computer, I sit on an exercise ball which requires constant adjusting of posture to stay on the Ball!
Halitosis is better than no breath at all. Any movement is better than no movement! If you do not have any exercise equipment I strongly recommend you consider getting a HealthRider. I think it is the most comprehensive total body workout device I have tried.
And I have tried many!
If you are interested, I suggest searching the internet for an exercise ball that fits your needs and the HealthRider.