All of the above items are considered personal risk factors for ergonomic hazards apart from A. Body Size.
Obesity or poor physical conditions make us more prone to musculoskeletal injuries. Poor fitness causes fatigue and is also a prime cause of weariness. State of health such as diabetes, arthritis, thyroid diseases, and hyper-mobile joints, although not conclusive,are more likely to cause musculoskeletal injuries (MSI). The goal of ergonomics is to eliminate discomfort or injury due to work and good working conditions will work perfectly.