The true measure of calories burned is oxygen consumption, but this is hard to measure outside of a lab. HRM's work on the principle that as exercise intensity increases, your heart rate increases in a generally predictable way to deliver more oxygen to your muscles.
An HRM is good for both sustained cardio and interval training.
However, it will not produce accurate results for strength training, as the muscles are working anaerobically (without oxygen), rather than aerobically (with oxygen), and your heart rate will not increase in the same predictable way.
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.
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