A heart rate monitor is an essential tool to stay across the intensity of your activity. I happened to get a MyZone MZ-3 Heart Rate Monitor for free when I signed up for a fitness class at a gym. This retails for around SGD149. A heart rate monitor is a useful tool for a cyclist helping one track and improve their fitness and training. By monitoring their heart rate, a cyclist can ensure that they are working at the right intensity level to reach their fitness goals. It allows one to measure the effort they are putting in, and adjust accordingly. Heart rate monitors can also help a cyclist to identify and avoid overtraining, which can lead to fatigue and injury.
The MZ-3 is comfortable to wear, using a chest strap provides accurate heart rate readings. It does ship with its own accompanying app. However, I just paired this with my Garmin 830 and it works like a charm.