Different people have different body structure. Hence, their ergonomic requirements do vary(for eg : a construction worker has different needs as compared to an executive sitting in the office and operating a computer). Office ergonomics include sitting in correct posture, how we hold our body, how we perform tasks etc. If our trunk posture is correct it improves the alignment of neck, back and head to reduce the tiredness we feel. It also focuses on match between people and their work environment.
Please visit Fitsio+ for further understanding of this condition.