Actually, an HRM for a strength workout like kettlebells will NOT help.
HRM's are based on an assumption that your heart rate increases to deliver more oxygen to your muscles. This is true for aerobic activities like cardio. But with ST, your muscles are working anaerobically (without oxygen), and your heart rate does not increase in the same predictable way.
HRM's do NOT produce accurate results for anaerobic activity such as kettlebells.
You are right however to be suspicious of the 900 calories figure. As a reality check for ANY calorie estimate, most people burn around 6 calories per minute for moderate exercise, and 10 calories per minute for more vigorous exercise.
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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