Mindfully release the tension in your body. Continue to breathe slowly and deeply, while scanning your body for feelings of tension. Start with your toes and work your way up your body, paying attention to each group of muscles as you go. Relax any muscles that feel tense by clenching them and then releasing them.
Most of us are out of balance all the time. Our search for happiness is a sign of being out of Center. We strive for success or to build self-confidence because our Center eludes us. Other symptoms of being off-center include pervasive anxiety, overwhelm, laziness, procrastination, and self-criticism.
This is an article by Madison Taylor as portrayed on the Daily OM website, link cited below. But I found it useful for describing what centering is.
When you take a deep breath just before going in to an important meeting or making important decision, you are centering yourself. Many of us center ourselves regularly without labeling it as such. A term often associated with meditation, centering is, simply put, taking the time to be in the moment, to focus and calm yourself.
You can center yourself in just a few minutes, and by doing so regularly you'll find that you can go within to take a break whenever you need it. You can center yourself by doing a simple grounding meditation. Close your eyes for a moment or two and imagine a bright, white cord connecting you to the sky; then imagine a deep brown cord connecting you to the center of the earth. Imagine those cords intertwining inside you, turning to a beautiful gold color and sending energy to every part of your body.
If you have time, close your door or sit in your car to be away from distractions. Sit comfortably and breathe slowly and deeply. Select a special word or phrase and repeat it over and over in your mind. Choose soothing words such as peace, love, or truth.
Another exercise that is energizing and relaxing at the same time requires just enough room to stand and comfortably bend over at the waist. Completely relax your upper body for a few moments; exhale and let your head and arms be completely loose. Let all your tensions flow out of you onto the floor, and think of emptying yourself. Then inhale, stand, and stretch upward as if you were taking off a tee-shirt. Imagine breathing in positive energy. Try a couple of these and you'll be refreshed and ready to take on any task at hand.
Finding a few minutes to center yourself will help keep you calm in the midst of a busy day. Chances are you'll be more focused, more pleasant to others, and the day may no longer seem quite so hectic.