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@Smallfurry
I've upped my intensity, and started introducing more intervals. Definitely more time efficient, and less fatiguing than trying to hold large volume.
Tried to do 20mins of over/unders on feel alone today (no powermeter :( ).
Looking at the data now, and it seems I was barely dropping below FTHR on my unders, and spiking horribly on my overs. Fell apart at 20mins. Not even at the top of the climb.
My power meter has destroyed my natural sense of pacing.