Being optimist have something more to look forward to which is having a long life. Because a person with a positive outlook and attitudes in life tend to have more stronger immune system, healthier lungs and heart. Putting your worries on writing can help you let your worries go away, which can keep your spirits up. Arguing with yourself, could let someone tell you're stupid? Maybe not, so tell your inner critic to put a lid in it too. Another one is be a saint. By helping others lifts your spirits. They say, show or do five acts in a day, no matter how small it is, it will guarantee you'll feel happier and be healthier.