I highly recommend the Huff Puff Qigong that Jeffrey Yuen teaches because of the multiple health benefits for those with a range of challenges from hypertension to chronic illness to cancer.  It is really fun and easy to do and the benefits are immediate.  The article below is very thorough and as an added feature, it gives you an email address to send away for your own Huff Puff Qigong DVD. Enjoy this practice!