Approach your fitness regimen in the same light. You know your workout is what is best for you and your health. NO ONE else can do it for you and there are no shortcuts. Too tired, too busy, too early, too late, too cold, too . . too something, right? There can always be an excuse, if you let it. OR you can decide to not let excuses get in the way because the only way you get lasting results for better health or a tighter body is to do the work. This means getting in your exercise and making your dietary changes and sticking to it.
Some people do well by putting the time in their schedule just like they would any other important appointment. You can also track your work through various online programs or phone apps such as myfitnesspal. Whatever works for you, find that way so that your workout becomes consistent, just as you would brush your teeth everyday. You do that for good oral hygiene, right? So why miss a workout which provides benefits for your health and well being?