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VO2

My girlfriend has a FR255S that she’s actually ran with for probably 10 total times. I have an EPIX2 and have ran with it a lot more. Can someone explain to me how or why her VO2 has been in the purple “excellent” since she bought the thing and she barely uses it? Makes no sense to me. It never goes down and never goes up. I run farther and longer than her too?