The document discusses ergonomics, which refers to designing work environments and jobs to fit workers' physical capabilities. It aims to make jobs safer, easier, more pleasant, efficient, and cost-effective by reducing injury risks from environmental and physical stressors. Some key risks include repetition, awkward postures, excessive force or pressure, and vibration, which can lead to cumulative trauma disorders over time like carpal tunnel syndrome. The document provides prevention strategies like taking breaks, maintaining proper posture, and seeing a doctor if symptoms arise.