Ergonomics is the applied science of designing and developing equipment, workstation layout and work strategies to best suit and protect the human body. The goal of ergonomics is to minimize fatigue, discomfort, injury and emotional stress.
It's important to recognize that even the most ergonomically correct environment will not prevent repetitive stress injuries if the body is simply overworked. The body has limitations with what it can withstand. Surpassing those limitations will most definitely result in injury.