I feel your pain, though mine is entirely self-inflicted.
Friday night, down visiting friends - have a few drinks and decide to see if I can still grab my foot and raise it up over shoulder-height as I stand on the other leg (it was relevant at the time, I swear!). Just completing the extension and feel a pop out of my hamstring, which has been sore since; I can barely reach down and tie my shoes.
I haz teh dumb.
Feel better soon!
Cheers!
-mistress k
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ill advised racing inc.