Heart rate monitors have been used by all kind of endurance athletes for the last 20 years. Since there is a strong correlation between oxygen consumption and heart rate, knowing your current heart rate is a great indicator of your current oxygen uptake, thus how hard you work. When you’ve used your monitor a couple of times, you will start to notice that you ride with a low heart rate the pace can be maintained for hours. Riding with a heart rate close to your maximum heart rate can be maintained for a limited time only. This is a very short description of why it can be useful to know your heart rate during bike ride. Read the 5 steps for better heart rate monitor training