How can a full body harness lead to injury despite preventing a fall?

A full body harness is designed to provide safety by distributing the forces exerted during a fall across the body, reducing the risk of injury. However, if a harness applies excessive pressure on sensitive areas such as the abdomen and groin, it can lead to discomfort or injury even though the harness itself is preventing a fall. This can create significant physical strain, potentially resulting in conditions like "harness-induced" injuries, where the pressure from the harness constricts blood flow or causes bruising.

Other options suggest various factors that could be involved with harness use. Disorientation and confusion may be a concern in general safety protocols but are not specific risks associated with harnesses themselves. Inadequate fitting can indeed lead to slipping, which is important to ensure for safety; however, the question specifically relates to injuries that can occur while the harness is functioning as intended to prevent falls. Exposure to harsh weather conditions can affect the comfort and usability of harnesses but is not directly tied to injuries caused by the harness itself. Thus, the focus on the pressure from a harness provides a direct link to potential injuries that could occur while still fulfilling its primary safety function.