Adrenaline is a hormone produced by the adrenal glands in response to stress or danger. It prepares the body for a quick reaction, often referred to as the "fight or flight" response. When you feel scared or excited, adrenaline floods your system, increasing your heart rate and energy levels, helping you react faster. This powerful hormone can also enhance your focus and strength, making it easier to tackle challenges. For example, athletes often experience a rush of adrenaline during competitions, which can improve their performance. However, too much adrenaline over time can lead to stress and health issues, so it's important to find balance.