Nice job, dude!  Beat me this week (only did low 40s).  Well, I ran the 10K this morning, wish I could say I raced it but there is no way I can use that word to describe what I did.  The first mile is straight downhill, and even trying to run slow, I logged a 5:16, and was in probably 30-40th place.  After that, the wheels fell off as I slowed down like crazy; was doing about 6:30 pace at the end.  I didn't feel like I was hurting and my breathing was fine, my legs just couldn't go any faster.  Oh well, I can only improve from this point on!  Did about 12 miles total.
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