The power of Breathing:
Relax yourself more deeply

All breathing is done through the nose

Sit or lie comfortably
Close your eyes
Take a deep breath in (stomach rising)
Exhale slowly (stomach falling)

If you are unsure about the stomach breathing please read here first

Now, inhale for a count of 4
Pause for 1 count
Exhale for a count of 4
Pause for 1 count
Repeat 3 times
This is called equalising breathing- the inhalation and exhalation are the same length

Now, inhale for a count of 6
Pause for 1 count
Exhale for a count of 8
Pause for 1 count
Repeat 3 times

Now, inhale 50% of your capacity and hold for 10 counts
Scan the body and face for any signs of stress
Now, inhale the rest of what you can and hold
Again scan your body for any tension
When you need to- slowly exhale the air completely
Allow your breath to regulate itself before starting a new round

The reverse also works:

Inhale deeply and completely
Now, exhale 50% of the breath and hold for 10 counts
Scan the body and face for any signs of stress
Now, exhale the rest of the breath and hold (no air in your lungs)
Again scan your body for any tension
Inhale when you need to
Allow your breath to regulate itself before starting a new round

Repeat as much as you like

This is very good to do before falling asleep or meditating

Equalise your breathing and visualise roots growing from the floor and "rooting" you to the spot before opening your eyes.