Avoid strained working positions

Plan your work so that you can completely avoid working positions that place you under strain.
Always use technical aids wherever you have the space and opportunity to do so.
Make sure you keep things tidy so that you can use technical aids.
Switch between various types of task and working position.
Avoid working above shoulder height and below knee height.
Wherever possible, avoid working lying down, squatting or kneeling over any length of time.