Long periods (potentially exceeding 8 hours per day) of walking, standing, sitting, bending, pushing, pulling, climbing, lifting, balancing, stooping, twisting, squatting, handling materials, repetitive hand-wrist motions, and traversing uneven surfaces; - -. Exposure to both extreme heat and cold; Exposure to loud noises, fumes, and airborne particles; In addition to the above demands inherent in every role, the following roles may entail unique physical.