Laughing is such a great quality which is possessed by human beings alone amongst all living beings. Laughing and smiling overcomes anger, removes tension, gives peace to the mind, save from heart problems and makes the face beautiful. Laughing loudly cures many ailments of the stomach that is why it is necessary to laugh loudly at least thrice or four times a day.
Make an effort to be smiling naturally while talking, walking, sitting, and standing and all the times. This will keep you always in a positive frame of mind, because when smiling such changes take in the chemical formation of body that prohibit tension.