Here's a good tip on how to care for your health - it's free, doesn't require any equipment and helps to de-stress at the same time: Conscious breathing.

Andrew Weil has three neat and succinct articles on his website regarding breathing:

Breathing: An introduction
How the breath connects the body, mind and spirit

Breathing: Basic How-To's
How not to hyperventilate

Breathing: Exercises
A very relaxing breathing exercise.

Try it! What have you got to lose?