After my run last night I commented to my wife that I was a bit disappointed with my time (W5 R2 3.53km in 31 mins @ an average pace of 08:50/km and a fastest pace of 06:31/km after 5 mins).
She told me I was doing brilliant and that there is no such thing as a bad run and that any running is better than not running at all.
She's been running on and off for 4 years now and she's right. Any run or exercise is better than none at all and at the moment I am running 4 days a week.