Make an exercise schedule for the coming week. Ideally try to include at least 3, 30-minute sessions of your activity. Begin with 20 minutes and work up to 45 minutes or more. You may like to try a variety of activities such as an exercise class one day, walking another and swimming another. Make time for your exercise by planning in advance. Set your alarm to wake you up an hour early, for instance, or organize a child minder for an extra hour at the end of the day if needs be, so you are free to exercise.