Practice deep breathing.

Focusing on your breathing and practicing deep
breathing exercises help relieve tension and stress.
Here is a simple exercise to do every day for a
few minutes:
Stand or sit in a comfortable position, with good
posture so that your stomach is not compressed. Put
one hand over your belly button. Now breathe in
slowly and deeply through your nose, letting your
stomach expand as much as possible. Hold your breath
for a few seconds, then exhale slowly through your
mouth. You may need to make a conscious effort to
relax your stomach muscles as you breathe in. When
you’ve relaxed your stomach muscles and this deep
breathing is working, your hand on your stomach will
rise and fall about an inch with each breath. When
your lungs are empty, start again with another deep
breath. After just three or four breaths, you should feel
the calming effect through your whole body.