Below is the note from my doctor excusing me from yoga classes:

Tammy
Yoga Studio
Boca Raton, Florida

Dear Yoga Teacher Tammy:

Kindly be advised that your student Gary Kahn is not expected to be in class this week.  He presented today at my medical office with flu-like symptoms.  Gary is asthmatic so we must pay careful attention to his lungs.  Since you are a yoga teacher, you should note that when the stethoscope was put up to his chest to check his lungs and he was asked to breath, he breathed through his nose.  This is not normal as he must breathe through the mouth for this test; I do not know where he picked up this habit.  He said something about pranayama, whatever that is.  Anyway, please excuse him from any classes he may miss.

In an odd request, Mr. Kahn did advise me to let you know that while sick over the weekend he watched a couple of documentaries about yoga.  These yoga documentaries included appearances by BKS Iyengar and Sri K. Pattabhi Jois.  He also watched the movies Seven Years in Tibet and Eat, Pray, Love.  Thus while he cannot physically practice he is mentally trying to follow the yoga ideals.  Personally, I think that he should let things be and not worry about missing classes and live by the American phrase, it is what it is, all is good.

Thank you and we hope this letter brings you a little enlightenment of the situation.