Physical factors include constant standing and walking; use of hearing, smell, near/midrange/far vision, depth perception, the field of vision; frequent pushing/pulling/carrying/lifting, stooping, kneeling, reaching, manual handling, and bending; occasional climbing, crawling and use of color vision. Working conditions include constant exposure to air quality; frequent exposure to extreme heat; occasional exposure to extreme weather, extreme hot/cold, wet/humidity, and noise.