When you least expect it

I'd decided not to run for most of this week to give my calf time to heal up a bit but couldn't resist a little run today. Only a short, easy one I thought. Ha! I PB'd over 5K, just like that. Only by 6 seconds, but the previous time was in a race with heaps of pacers, now it was just me and the traffic lights. The calf was fine, but my right thigh complained instead, just like at the race. Aargh!