You changed how the fitbit determine active minutes and Heart Rate Zones. The majority of the population will operate well at the standard zones, especially older people. Many conditions affect older people making these new zones very dangerous. Option to use standards or set your own doctor recommended zones should be included.
As I stated, many older people have conditions that making working out at the rates you suggest now dangerous and should have the option to set the old rates which are national standard and work for the vast majority of regular people not athletes and you should have an option to set the levels your doctor set for you.
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