Frustrating run yesterday

So I ran 5 miles, but for the first time since last summer I had to stop and walk for a bit.  Really frustrating (ended up 5 miles in an hour).  Could have been the sun, or the temperature (70 deg), or the 2-hr zoo visit previously, or the noon-time before lunch but it was annoying!

I need a goal, and am thinking about doing a half-marathon.  I just need to find one.

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