The teacher must know the location and activities of every child, maintain required staff-to-child ratios, perform accurate name-to-face counts, and ensure children are supervised during classroom activities, meals, rest time, toileting, transitions, outdoor play, arrival, dismissal, and emergency drills. The employee must be able to sit on the floor or in child-sized furniture, kneel, bend, squat, stand for extended periods, move quickly to respond to children’s safety needs, participate in indoor and outdoor activities, and lift or carry children and classroom materials weighing up to 40 pounds, with or without reasonable accommodation.