This is more like it, the fourth day of running in a row with a mini progression run. A true progression run would have pace increases throughout, starting with the slowest and ending with the fastest. This was more of a bookended progression run, with the first and last 10 minutes at an easy pace (heart rate zone 2) and the middle 25 minutes at a steady pace (heart rate zone 3).
It was cold and icy out there, so some of the heart rate spikes may have been due to conditions underfoot rather than the effort of running (though doesn’t the heart need to work harder in colder weather anyway?). Strength and conditioning tomorrow and a return to the gym with CubaTone.