In reply to d508934:
I have been having problems with my quadriceps above the knee and feel there weak. I shifted more to cycling in the mean time. Use one of those foam rollers (got mine from Argos) before and after. had some rest like yourself. I was well over doing it 45miles a week and nearly 1500m uphill and downhill pounding after only 3 months starting.
Someone recommended Mega Cissus as a supplement and some folk rave about it but I don't really see much from it to be honest. From My protein works for some but not me.
On you tube there's videos of various stretches that are good and how to use the roller properly. The roller was only £10 from argos and is very good I find.
I would get something frozen for 10 minutes onto the area immediately after exercise. I have a frozen bag of peppers that are for this purpose only not for human consumption, the family know the bag well. Stretches after exercise as well and I also try to do some mid run these days. Although still only doing about 12 miles a week at the moment.