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@Smallfurry
I have 'fair' loads.
I did a 60min turbo session on the tri bike then headed striaght out for a run. When I started the run garmin said 'fair' and I went on to set a 2016 5km PB. I suspect I'd have struggled to do anything longer though.
I also get epic recovery times.
My peronal feeling is that something in the nature of my heart puts it somewhat outside the assumptions firstbeat made. So while I take nterest in the data. I dont follow thew specific numbers.