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During last year or so I noticed that my quads get sore not only from running but walking too. I do not understand where it comes from since before that I had been able to walk for quite long distances although I have flat feet but walking shod in running shoes always helped. Now I can walk for 10k but for next couple of days my quards are sore. Stronest pain is in the low parts of muscles where they are attached to knee bones.
I'm a cyclist but also a runner wanna-be but I quit running and switched back to cycling in December because of this soreness. I had to stop running and minimize about of walking and it took two weeks to recover.
What cause can it be? Any ideas?