Many of my patients are very busy professionals who spend most of their days sitting in front of the computer, whether it be at their desks, in airports and on planes. Never wasting a good moment. However, they are often filled with tension from poor postures and stress. I teach most of these people the very basic sun salutation from yoga. It is a fantastic way to quickly stretch and re-oxygenate your body.
The following article gives some examples as well on different ways to easily perform some of these exercises on your own:
http://www.nytimes.com/2010/05/06/business/06YOGA.html?partner=rss&emc=rss