Perhaps it is late to respond to this comment string. However, I have found a very simple exercise to relieve my stress throughout the day.
I went to a Cancer Retreat over the weekend (at Ghost Ranch, NM) and we did an exercise called “iomogi” breathing (not sure about that spelling). Basically, you breath in deeply through your mouth to the back of the throat, and out the same way. You breath deeply into your stomach and release your breath slowly, starting out of your stomach. Each breath you count to 6 while inhaling and exhaling. As you feel confident that you can breath into the back of your throat you start breathing in and out of your nose, if you cannot make that switch (I have not been able to) not to worry it will work either way. Some people can get up to 30 seconds with each breath!
The point of this exercise is that it helps to relax your autonomic nervous system. Related some chemical in your brain and you automatically relax. I did it when my heart rate was up to 110, and I was able to relax and lower my heart rate.
Now I am not the type of person who tries these alternative exercises, but I realized I needed an open mind to get all the benefits of my retreat. Wild as it seems, It worked!
If someone knows what this breathing exercise is called, I would be grateful if they would let me know.