Pulled Something

I was sitting down this evening and somehow pulled or tore something in the hamstring area of my left leg.  Sharp pain.  The pain came back several times when I got up or sat down.  I worked out and Nautilus and then ran 1.7 miles on the roads.  Thankfully, the pain did not come back while running.  Hopefully, it is nothing to worry about.  I hate to think about what it is going to be like when I get old.