How so?
Competitive Bodybuilding is quite mentally taxing.
Firefighting is known as a very mentally taxing career.
Shift working, long hours, consistent and constant exposure to death and destruction, impending doom with no end in sight.
PTSD is very common amongst firefighters
The continual battle with anxiety, detachment and depression would take its toll on a bodybuilder's ability to the stick to their program.
The issue is compounded by the rigours of training, caloric deficit and bodybuilding drugs especially insulin (hypoglycemic anxiety)
The outfits they wear are very hot, meaning overheating constantly and being very uncomfortable. Doesn't exactly inspire you to get bigger and heavier. (Doesn't exactly inspire you to use tren either)
Cortisol galore