shift, (stand 3 hrs., walk 3 hrs., sit 2 hrs.), frequently (bend/stoop/twist, reach above shoulder level, push/pull), occasionally (reach below knee level, squat/kneel/crawl, climb stairs, work with arm outstretched, work above chest level). Required to have visual acuity to perform an activity such as: operating motor vehicles and/or heavy equipment; determining the accuracy, neatness, and thoroughness of the work assigned such as custodial, food services, general labor, etc.