Running through Fatigue
After a hard workout session running maybe the last thing on your mind but running the following day can prevent additional soreness in the delayed-onset muscle soreness. The day after a hard workout an easy run will actually make you feel better. Important factor here is the EASY running part when your muscles are sore they will also help you psychologically by increasing mental toughness. Just do low milage and a slow steady pace to loosen the muscles
Running Times website says “Exercise itself is analgesic, so on those days when you find your muscles sore from your last workout you will probably actually get some relief from a light recovery session.”
So dust of the cobwebs and go out and enjoy yourself - just take it easy !