Most fire departments don't require annual physicals. Strong fats learn how to suck it up through initial PAT tests and the academy, although most of them injure themselves and go on light duty for at least some portion of time. They half-ass their way through PT and suck down so much air from their air packs that they are only ever doing work for maybe 10-15 minutes (most places use 45 min cylinders). Then they graduate the academy and start eating. Sometimes they lift a few weights so that they can still do the strong work. They eat a 1500 calorie breakfast of bacon and sausage and syrup with a pancake justification. Then lunch is a 1000 calorie "salad" of cheese and croutons because "I'm trying to lose some weight, man" and dinner is 2000 calories of hamburgers, mac and cheese, and broccoli because "we eat healthy on our shift." There's cookies on the counter that someone brought by as a thank you for helping out their grandma last week. Add in all the caffeine (coffee has to be half cream with a cup of sugar and pop cannot be diet) and they gain 100 pounds by the time they hit their 5 year mark. They have no self control. They have no idea how much it affects their job performance. None.  Or they are volunteers who never had any kind of physical testing in the first place. They want to be a hometown hero so they sign up and wear their vollie t-shirt everywhere.