OBSERVATION: Scientific evidence and personal experience teach us that approaching each daily task and our lives in general with a positive attitude (optimism, enthusiasm, confidence) significantly increases actual success and enhances personal happiness. Yet many of us stifle our careers and pollute our personal relationships by persistent negativity. Just as losing weight and keeping it off is really hard, so is losing self-defeating attitudes and staying positive — but it’s doable and worth it. The strategy: self-consciously cultivate optimism. Here are some suggestions to help you more consistently reap the benefits of positivity.