EE WAS TORQUEING BOLTS & NUTS ON KILN TIRE FROM MANLIFT. AS HE TORQUED ONE SIDE, ANOTHER EE IN AN ADJACENT MANLIFT WAS TORQUING THE OTHER SIDE. THEY WERE SHARING THE TORQUE WRENCH & SOCKET & H AD TO REACH REPEATEDLY BACK & FORTH BETWEEN MANLIFTS TO SHARE THE TOOL. EE BEGAN TO FEEL BACK PAIN THAT EVENING & WAS SENT TO THE DOCTOR THE NEXT DAY & PLACED ON RESTRICTION FOR PULLED MUSCLE