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I'm using a Garmin Forerunner 405CX watch and following Garmin's Training Plan - Level 2.
Today's Week 2 run was to be 5x2 mins at 10k effort with 60 secs jog between efforts. I understand 10k effort to mean 92-94% of my Maximum Heart Rate (is that the same as Heart Rate Reserve?) of 185bpm, but I could barely reach 170bpm and had trouble sustaining that for 30 seconds, let alone 2 mins!
I'm assuming that I'm doing something wrong here. And with my troubled relationship with science and numbers, that doesn't entirely surprise me.