Deep breathing...or Meditation, which I feel, is more holistic. Or any related technique thereof.
It is important to pick up one meditation technique we are very comfortable and focus on it. ( Can suggest a few, simple ones to choose from)
Then allow to grow. Guidance will come from within.
Love & Light
5 Easy Ways to Eliminate Stress and Perform Your Best | Inc.com
Buddist Meditation - courtesy Speaking Tree ToI