Implementing effective "Workplace Ergonomics" seems simple in theory but can often be difficult to implement effectively in many workplaces. It does require regular review and does not necessarily need to be costly to achieve the result of reducing workplace injury risk. A simple Google search will find numerous "ergonomic workstation posters" on what is the correct sitting posture. However, the below resource attempts to go further than just provide a diagrammatic representation of how to sit at work.
Rather the below resource is a one page tip sheet of key "ergonomic principles" which you may find useful in implementing strategies more broadly across various workplace tasks.