*3.3.1. Physical factors*

Repetition of the same movements during work, improper postures, static posture, excessive use of force, and squeeze are the physical dimensions of the ergonomic risks. Repetitions of the same or similar movements during work can cause pain and discomfort in the musculoskeletal system because the muscles are not given enough time to rest [41]. Natural postures are the safest and most convenient way to work. Non-natural postures force the physical limits of the body by putting pressure on the muscles and joints. The long standing of the worker in the same position limits the blood flow and makes the muscles tired and injured. The excessive force applied to the muscles causes the muscles to contract more than normal, causing the joints to overload and cause injuries. Compression of the soft tissue between a bone and a hard or sharp object reduces blood flow and nerve conduction, damaging tendon and tendon sheath [41].
