EMPLOYEE (MATERIAL HANDLER) WAS MOVING A 55 GALLON DRUM. WHEN MOVING THE DRUM THE BARREL STARTED TO TIP AND THE EMPLOYEE TRIED TO STOP THE BARREL FROM FALLING. EMPLOYEE STRAINED HIMSELF IN THE LOWER STOMACH. HE NOTIFIED THE FOREMAN OF THE ACCIDENT JUST IN CASE IT WAS A PROBLEM AT A LATER TIME. THREE WEEKS LATER.