Regular chanting of Om is good for physical, psychological, and spiritual well-being. There are three ways in which one can chant Om: silently, silently but mouthing, and loudly. Of course, one needs to chant and meditate with utmost focus to reap the benefits. Just concentrate on the breathing, take deep breaths, chant the mantra, and connect with the universe. You will experience the power of Om, and understand why it is called the greatest of all mantras.