Prolonged periods working on feet performing repetitive actions that require frequent standing, walking, bending, twisting, stooping, reaching and/or lifting from the floor, waist, overhead, chest, and/or knee level; may also be required to squat, kneel, push, pull, carry, grasp with hands and fingers; use of hand tools . Prolonged exposure to moderate to high levels of noise, laser beams, flashing or blinking lights, machine signals and other sounds associated with a manufacturing environment.