When exercising in extreme temperatures, precautions are vital to prevent injury or heat-related illnesses. In hot weather, it's essential to stay hydrated, wear lightweight clothing, and avoid the hottest parts of the day. Acclimatization to heat gradually can help the body adapt. Conversely, in cold weather, layering clothing and protecting extremities are crucial to avoid hypothermia or frostbite. Always listen to your body and recognize signs of distress, adjusting your workouts accordingly.