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HRM Pro Plus calibration question

Hi

Question regarding HRM Pro Plus calibration

I use it just for tracking basketball.
I need to chase something when I run, hate pure-plain running Wink
The strap is giving me correct HR and load but the distance is super low (below 1km from 1h30min).
I guess this is because strap was not calibrated as I’m not using it for running.
Question – will it calibrate from walking activity? Or it has to be running and I need to suffer a bit to calibrate it?