"The only constant in life is change." Change is constant. Your physical body changes on a minute by minute, day by day, month by month, year by year basis. You know that you CAN exert considerable control over that, by, smoking or not smoking, exercising or not exercising, the foods you eat, and so on. Some people choose to do cetain things deliberately, to control their weight, get and stay fit, and healthy. others do not. But everybody changes physically.
Change happens in every other aspect of life too, for everybody. Marriage. Divorce. Kids. Get a job. Lose a job. Buy a home. Move. Get older. learn something new. Education. The list of changes is endless. You just cannot escape constant change. But you can make it work for you or let it work against you.
If we continue to DO the things we have always done, we can only expect to get what we have always got. whatever change happens, it will work against us. Opportunities will pass us by. Only by first changing our own actions and behavior can we create other desirable changes in our life. (To be continued, official ICS guide)