What must individuals be aware of when exercising in extreme temperatures?

When exercising in extreme temperatures, being aware of the body's condition is crucial because it directly affects how someone performs and responds to the environmental stress. Factors such as acclimatization, fitness level, hydration status, and existing medical conditions can alter an individual's tolerance to heat or cold. If someone is not in good condition or lacks proper acclimation, they may be more susceptible to heat-related illnesses, such as heat exhaustion or heat stroke in hot conditions, or hypothermia and frostbite in cold conditions. Recognizing the body's signals, such as excessive fatigue, disorientation, or discomfort, can help individuals make informed decisions about whether to continue exercising or seek a safer environment, thereby promoting safety and optimal performance.