Firefighters may not have the physique of pro athletes, but that doesn't mean they're not fit. Take a moment to visualize a firefighter in action. Picture someone carrying a heavy ax with a big coat and large helmet? Did you notice the thick SCBA tank on their back, or the big boots? Well, the ax weighs close to 20 pounds, and the SCBA tank can weigh up to 50 pounds, depending on how full it is. Imagine carrying all of that while sprinting through a fire! Your local firefighters may not step…