Ergonomics is something that everyone needs to be aware of in their daily life. This could be a reason for injury or pain. Ergonomics can make your days more enjoyable and comfortable if you take a few moments to become aware of your movements, thinking (behaviors), and environment. Ergonomics can be broken down in Greek words “ergon” means work and “nomos” means natural laws. And Ergonomists study the human body capabilities related to work demands. There are three area that Ergonomists review, physical ergonomics, cognitive ergonomics, and organizational ergonomics. Physical ergonomics is our body and how it is set up. Cognitive ergonomics is our mind power and what are brain’s capabilities and abilities. Organizational ergonomics is the space surrounding us and what we come in contact with in our work spaces (desks, chairs, etc). Ergonomics developed from the Alexander Technique. Alexander Techniques try to teach individuals to use their bodies with more appropriate levels of work in a relative activity.
Source - http://www.ergonomics4schools.com/lzone/office.htm