Why am I so sore today?

Trying to figure out why my arms are so sore today.  If my arms are sore, then I won’t want to go to the gym and swim tonight, which was in my plan.  What gives?  I only went for a 5 mile run last night. 

Oh right, I spent almost 2 hours yesterday morning cutting, pulling, wrestling with, and dragging massive vines out of my yard.  Guess I gotta work my arms up into gardening and weed whacking shape…

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