Another way of goal setting can be to make an "ongoing goal". For example, by that, I mean a goal that continues to be effective for a long time. One of my goals is to make BETTER, HEALTHIER choices than I would have in the past. So, at the start with nearly 200 pounds to lose, I would have success by eating 11 doughnuts instead of 12 - now, with less to lose and still a long way from goal, I would NOT consider THAT terribly successful, but when school started and there were doughnuts available 3 days in a row and I ONLY took 2 and ONLY ate 1 in the whole 3 days. Obviously, my definition of success changed dramatically, but my goal remained the same. When I get closer to my goal, my definition of success will undoubtedly change quite a bit because my previous successes built on each other. The same sort of process works for exercise - 5 minutes is better than zero, but then 10 minutes is better than 5 and so on until I reach a reasonable exercise level.
Choosing goals that allow you to SEE success frequently and when you celebrate your small successes, they encourage you to try harder and to move to newer and more challenging goals. Monthly, weekly, and even daily goals are things you might add depending on where you are and what you want to achieve. Your goals in other areas of your life can really impact your healthy lifestyle, so some might include getting enough (make it specific - 6, 7, or 8 hours) sleep each night, or spending some time relaxing with your family after (before, during, after whatever works for YOUR family) dinner for 30 minutes, or whatever you think will improve your ability to live a healthy lifestyle.