Because the work is inherently very dangerous and complex, workers coordinate in carefully prepared and well-organized teams. When a call comes in, day or night, they have 3 minutes to get ready and out the door. Between alarms, firefighters spend time at the station, often taking classes, cleaning and maintaining equipment, conducting practice drills, and working to maintain physical fitness. Hazards of this work involve risk of death or injury from crumbling building structures, or exposure to flames and smoke. Firefighters may also come in contact with toxic, flammable or explosive gases and chemicals, or other hazardous materials that could have long-term health consequences.
Modern gear does include protective suits and masks, which can be very heavy.
Work hours of firefighters are usually longer and more variable than in most job settings. In some cities, they work a continuous 24-hour shift, followed by 72 hours off. They must learn to adjust their personal life activities and biorhythms to accommodate this demanding routine, and remain alert and ready to go immediately when a call comes in. For municipal firefighting jobs, applicants may have to pass a written exam, as well as rigorous tests of strength, physical stamina, coordination and agility, as well as drug testing. Those who score highest on the exams have the best chance for hire.