5, 2, 7, Breathing

Certain breathing exercises seem to be good for me. I practice them occasionally. After a practice I usually feel good as well as being a bit more awake and alert.

Some are a bit more complicated or difficult than the following, but some are even simpler and easier:
Inhale for a count of 5.
Hold for a count of 2.
Exhale for a count of 7.
Repeat, say, twelve times.