Whether you're an experienced or novice runner, there are three simple rules all runners should live and train by.
Rule #1: Be consistent with your training.
Try your best to stick to a schedule. Avoid skipping workouts too often. With that said, avoid doubling up on workouts when you do skip. Consistency is the key to training.
Rule #2: Listen to what your body is telling you.
People tend to ignore what your body is telling you. Pay attention to areas of your body that ache or are sensitive. Pain is your body's way of telling you something is not right. Small aches can turn into big, chronic pains in the future if not treated properly. Don't try to run through an injury. You'll only make it worse. If your aches do not go away after a few days of rest and a little T.L.C, contact your physician.
Rule #3: Allow your body time to rest.
Rest is one of the most overlooked aspects of training; however, it is of the most important aspects of proper training. If you do not allow time for your body to rest, you risk injuring yourself. Your body needs time to heal, if not it can begin to break down. Get enough sleep each night, add in light training days to your training schedule and allow yourself a day off. As long as you're maintaining a consistent schedule, of course.