When you run fast...Bring a friend. A buddy will boost your motivation and morale and help you push when it would be more comfortable to quit. Never quit and friends don't let friends quit when the tough get going! Don't compete with each other, but don't let your pal off the hook either. Encourage each other to complete the goals.
When you run long...Take more frequent walk breaks. If you currently do a ratio of one minute running and one minute walking, reduce it to 45 seconds of running, one minute walking. Use the Jeff Galloway method of running. Don't know who/what this check, you can find out here: http://www.jeffgalloway.com/
It will help you run farther, minimize soreness and hasten your recovery.
Changing is hard but with these tips, change should be easier and help you to become a better, stronger, faster runner! Do you have any tips that worked for you to change your routines or running techniques?