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Heart Rate Reserve Data Field - not showing - any setting I've missed?

Former Member
Former Member
Have been using the FR235 watch to train within heart rate zones for the last two months and have used the %MaxHR Data Field so far.

Have been reading about also using the %HRR to identify more accurate HR training zones.

I have configured the %HRR and Avg %HRR as Data Fields - but all it shows during activities is "--" !

Have I missed some configuration somewhere (watch, Connect) for setting the RestHR and MaxHR?