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What is causing my back muscles to knot up while walking on the treadmill?

Posted by Charles

After I get off the treadmill my back begins to hurt a little bit & the next thing I know I get an extremely painful charlie horse in my back. The muscle actually knots up & makes a visible lump.  It happens about halfway up the back.  It gets so bad I become sick to my stomach. How can walking cause such a thing?
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