In the task illustrated below, a worker positions himself midway between the hand truck and the mixing hopper. He twists to his right without moving his feet and picks up a bag from the hand truck. He then rotates to his left to continuously place the bag into the feeding chute. The bags are made of a flexible plastic casing and sag as they are picked up. The bags weigh 40 lbs. The worker feeds them to the hopper at a rate of five per minute for 3 hours daily. The load is 15 inches from the worker (H) at the origin and 20 inches at the destination. In observing the worker perform the job, it was determined that the non-lifting activities could be disregarded because they require minimal force and energy expenditure. Significant control of the bag is needed at the destination (feeding chute). Although several bags are stacked on the hand truck, the highest risk of overexertion injury is associated with the one on the bottom of the stack; therefore, lifting the lowest bag will be examined