There are plenty of app smart heart rate monitors that help you exercise in the right zone. The Frontier X2 takes it to the next level. It is an app connected heart wearable that uses AI generated cardiac rhythm markers to spot changes in your heart rhythm. It can record continuous ECG. It not only helps you exercise in the right zone but avoid heart strain.
The Frontier X2 comes with vibration alerts. You can record and livestream your heart rate with others in the world. The device is waterproof to 1.5 meters and can be used for cycling, rowing, swimming, and other activities. It uses AI algorithms to give you recommendations.[official site]