Lactic acid: Lactic acid is likely building up in your muscles, causing the muscle spasm and tightening.This occurs when you start to burn substances other than glucose during activity. With a long walk, you may not have enough water on board to burn glucose, or you may not have enough energy in the form of carbohydrates to supply your system with enough glucose so eat fruit as you walk and drink lots of water.
Answered 6/26/2014
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