Your goals must be consistent with your personal beliefs. Assuming that you believe that good health is important, then the goals for achieving that goal will be well aligned. As soon as you set goals, your subconscious mind will encourage you to reach them. Start each goal with the word “I” and write in the present tense.
If you doubt that good health is a worthwhile goal, sit down and write down the consequences of your current health habits. If you smoke, you may write that poor stamina, cancer, and emphysema will occur in the future. Do that for each of your health habits – the good and the bad ones. That would let you believe how worthy good health as a goal for you is and the desire to accomplish it.