As an old guy you have to find ways to motivate yourself beyond PR's. All of my PR's at 10k and below are now over 10 years old. I could start running ultras - or I could find some kind of simple mathematical formula to find new goals for these distances.
Since running from sunrise to sunset isn't my idea of a good time (for the joys of ultra marathoning see Alyssa's blog) I found a way to challenge myself with some realistic goals at distances that I haven't raced for a long time.
I came up with an idea after running an all-out 400m tonight for the first time in almost 15 years. Somehow I managed to break 60 - which is ~5 sec off my PR (sadly enough). So I thought, what if I gave myself a 5 sec grace period per 400m for all my PR's under 10k? I did the math - and while challenging, I think I can do it.
I might save the 5k and 10k for next spring - but, I'd like to do this for at least the 800m, mile and 2 mile this summer. My goals would be 2:08, 4:35, and 9:36 (based off of 3k PR) respectively.
Next Tuesday - the 800.