The heart has an electromagnetic field 5,000 times stronger than the brain's electric field. Why is that? I don't think it is an accident. Life really is the best designer!
Author Iyanla Vanzant calls the heart 'your map' for your life. Meditating or even just putting your attention on your heart regulates and normalises the heart beat (and your breathing) and creates a calming effect on the body by raising levels of feel good hormones and lowering levels of stress hormones.
Sit quietly and breathe into your heart, follow your breath in and out of your heart or repeat a mantra. It doesn't matter, whatever you feel comfortable with. Do this for at least ten minutes. With regular and/or daily practice you will notice more peace and happiness in your life.