How do you maintain a fit and healthy lifestyle?

Moderation. To stay healthy you need to eat healthy foods in moderation. Fresh fruits and vegetables, whole grains and lean meats are all healthy if not taken to excess. Exercise is also an important part of maintaining a healthy heart and lungs. It is also important to avoid drugs, tobacco and alcohol to excess.
Focus on… Focus on: 1. Improving your diet. 2. An exercise program. 3. Stress reduction. 4. Avoidance of toxins such as nicotine, drugs, and excessive alcohol. 5. Associate with people with similar/positive outlooks. 6. Ample rest/sleep/recreation time. Seek professional help in any of the above areas as needed. Best wishes.