People continue with a behavior when it's rewarding. Rewards can be either internal or external. Internal rewards are truly the best kind. Frequently we learn to be very hard on ourselves and deny the things we most want to hear. When you are trying to obtain those running goals, talk to yourself the way you would talk to and encourage your best friend.
External rewards help too.
Find some things you really like such as rewarding yourself with a soak in the tub after a run or giving yourself 15 more minutes to sleep in the morning. External rewards can also entail setting aside some money to buy something special such as a cassette tape or a new outfit. Of course these types of external rewards will depend upon your financial circumstances but you can be very creative with rewards. Asking someone to do something for you that you normally do for yourself can be a reward, and you should not hesitate to involve others in your reward system as well as your running goals. In summary, now is the time to get back into your running routine.