― Computer Ergonomics. The above image shows how one should work on a computer. Bad sitting position encourages bad body posture which also leads to back pains, etc. ∙ For a clearer illustration: ∙ Head – Head back. Chin tucked. Ears, shoulders and hips aligned. ∙ Neck – Use headphones. Do not cradle phone between head and shoulders. ∙ Elbows – At sides – slightly more than 90 degrees bend ∙ Chair – Fully adjustable with lumbar [...].