Work environments may include typical office settings, construction sites, extreme weather, high-noise areas, safety hazards (e.g., electric currents, working at heights, scaffolding), exposure to chemicals, fumes, dust, or poor ventilation. Physical activities include sitting, walking, talking, hearing, reading, writing, keyboarding, driving, filing, reaching, stooping, crouching, bending, standing for extended periods, and lifting or carrying up to 40 pounds.