For those who are too skinny, they should look into improving their eating habits: (eat regular meals, eat healthier foods, maybe eat more carbohydrates and fat and muscle-building foods). For those who are too fat they also need to improve their eating habits: (also only eat at regular scheduled eating times. no snacks or in-between meals), eat foods low in fats and carbohydrates, and then begin a regular and systematic exercise program which will focus on taking off pounds and firming up the muscles in the areas where the fat most readily accumulates. For those who are sickly all the time, a good visit to the family physician and a thorough physical examination would be a good place to start. Then add to that some of the principles just discussed: eating regular meals, eating healthier foods, and also cut out junk foods. If the physical shows any virus, germ or infection, then it would be important to first remove the `bug' before the improved diet would have any effect. For those who are always tired you can begin by implementing all of the afore-mentioned, plus add to that a few other things: getting an adequate amount of daily rest (sleep, or a nap when needed), plus take care to not overdo ones' self in other aspects of daily life. working too long or too hard, playing too long or too hard, strive to also maintain yourself emotionally, because an unstable emotional condition can also contribute to a person's lack of energy.
Second is vocational improvement. A great number of people start their careers, and then because of financial obligations and commitments, they may work in their same jobs for a number of years without daring to step out of that circle of security. It would be good for a person (if they like their job) to give themselves the challenge of either doing something new in their work, or finding a way to do their job better and more efficiently. Maybe they should set goals regularly and then strive to achieve those goals. If they don't like their jobs they shouldn't be afraid to look into another line of work and not be afraid to do something different (always remembering to make a thorough investigation of the alternative before a change is made). If the person has never received a higher education (above high school) he/she might want to consider going to college and working part-time while attending. The additional education would motivate them to search out another line of work that would be more challenging or more satisfying for them.
Third is to improve yourself culturally: To improve your social relationships with people, and to improve your knowledge of the "finer things of life" so as to be able to mix and communicate with people well in any social setting. You would be a little embarrassed perhaps, if a friend asked you, "What do you think of Schubert?" and you said, "My shoe shiner's name is Ralph, not Burt, and he does a real good job!" So what might be the motivation to be more `culturally refined'? Making a mistake like in the previous example, and then having someone walk away and start talking about what an airhead you are could be a start. You then need to begin to educate yourself in the arts, in aspects of personal refinement, personal grooming, care and dress etc.
Finally, if a person feels that there has to be more to life that just getting up in the morning, eating breakfast, going to work, coming home, watching TV and going to bed, or if a person feels down, or has a death in the family, or has a desire to have some perplexing question answered in life, all these may serve to motivate the person to do some inner soul-searching and to seek answers to their questions from a `higher source'. This search will almost always result in spiritual growth, which will bring a greater sense of meaning into the person's life.
These are just four areas in which a one could become `a better you' and some of the motivational factors which could contribute to that growth in a person's life. There are many other areas of improvement that could be mentioned.