Aching feet

My feet ache today! Both of them, underneath each arch. They are quite old now, and in recent years I've run between 1319 miles and 1800 miles per year (depending on whether I was pregnant or not!) I now add a couple of circuit classes a week, and they've already endured the many hundreds of miles I used to walk in my previous 2 decades! I don't blame them for aching, but they don't often give me grief!! Perhaps I overstepped the mark yesterday, or maybe it's just a sign I need a day of putting my feet up....