Running is a great form of exercise, but you don't want to get stuck in a rut of hopping on the treadmill every time you go to work out. Not only will you end up getting bored, but you're apt to injure yourself from the repetitive motion.
Make a pact with yourself to include at least three different types of cardio throughout your week. Run on Mondays, swim on Tuesdays, run on Wednesday, play a friend in a tennis match on Thursday, jog around the park on Friday, and Saturday or Sunday go for a bike ride. There are so many ways you can move your body, and not only will mixing up your cardio help you prevent injury, but you'll end up strengthening more areas of your body.