If you use scientific knowledge about body health to help design workplaces that keep workers healthy, then you work in the field of ergonomics.
Ergonomics might remind you of economics, because it's a word that was invented to bring an efficiency-oriented type of thinking to the workplace. It breaks down to erg-, Greek for "work," and -nomic, Greek for "the laws of." Your special chair that prevents you from slouching and positions your hands at the perfect angle in relation to the keyboard was made by someone who works in ergonomics, which is why it was probably called an "ergonomic chair."
