Haven't started an exercise routine yet? Seize the day, but think about starting out with something you enjoy.
It is hard to maintain a routine based on an exercise that you dislike, no matter how great you hear it is for you. A good example of this is jogging. Many folks try to run because they know it's great calorie burner but the fact of the matter is that you're not going to burn any calories if you can't bring yourself to actually get out there and run regularly. Maybe down the line you'll enjoy jogging, but for now, stick to something you actually like (walking, hiking, yoga, etc.) because that will increase the likelihood that you'll do it more regularly.