- Hypothermia is a medical emergency that occurs when the body loses heat faster than it can produce heat, causing a dangerously low body temperature below 95°F. Prolonged exertion leads to progressive muscular fatigue and loss of judgment. - To prevent hypothermia, one should wear warm, multi-layered clothing including headgear and change into dry clothes if wet. Finding shelter can also help stay warm. - Overexertion refers to excessive training that causes physical conditions from repetitive motion or pushing oneself too hard in pursuit of performance. It is characterized by fatigue, irritability, sleep problems, and increased injury risks.