EE HAS BEEN FILLING BACK TIGHTNESS FOR ABOUT TWO WEEKS. AT 0800 ON 5-7 HIS BACK REALLY STARTED HURTING. ON THE NEXT DAY HE ASK TO GO SEE A DOCTOR. CAUSE OF TIGHTNESS MUST BE FROM EVERYDAY WORK ACTIVES. EE LIFTS AND STACKS 100 OR 50 POUND BAGS OF SAND DAILY.