Physical Danger
A brew house isn't the small kitchen homebrew station you set up with your dad when you were eleven years old and looking for a "science project." It's a manufacturing plant—it just happens to be manufacturing beer.
There's heavy machinery, which always means you need to be careful. And if there isn't heavy machinery, that's because you are the machinery. Believe it or not, no chiropractor ever said the key to a life free from back pain was thirty years of heavy lifting.