An HRM is not going to produce accurate results for a strength training workout such as kettlebells.
With cardio, your muscles are burning aerobically (with oxygen) and your heart rate increases in a fairly predictable way to deliver more oxygen to your muscles as you increase your intensity.
With ST (and this includes kettlebells), your muscles are working anaerobically (without oxygen), and your heart rate doesnn't increase in the same predictable way. So a heart rate monitor will not produce accurate results.
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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