Maintain emotional control under stress; work with frequent interruptions; frequent walking, standing, stooping, bending, pulling and pushing; lift/carry 10-25 pounds frequently, 25-40 pounds occasionally, more than 45 pounds infrequently with assistance; pushing/pulling 10-35 pounds sporadically; May be required under specific circumstances to provide physical restraint of students in danger of causing harm to themselves or others. Frequent exposure to: Work indoors and outdoors in varying climate conditions (hot and cold) on uneven surfaces, humidity extremes, noise, low or intense illumination, vibration; occasional exposure to biological hazards (communicable diseases, bacteria, insects, mold, fungi, etc.).