It can't be true that 955 can't display the heart rate reserve? Lots of runners use HRR.
Why do you need to see it to use it? I mean, you can set zones based on HRR (which basically is HRmax - HRrest right?).
Don't understand what you want to mean but i have my heart rate zones based in HRR. It display everyday my minimum heart rate and if my resting heart rate change my zones change too
