Alas, my Garmin was experiencing interference that made the HR numbers go wildly all over the place - I think I should try turning it on in the parking lot outside from the gym to see if it can get a lock in on HR before I go in and it starts getting barraged with other signals. So I will just have to call it zone 3/4 intervals, unspecified HR - I am pretty sure at least some of the time was in zone 4, but it is harder to use rate of perceived exertion as a proxy when I'm out of the habit of hot treadmill running...
12min warmup
5 x 4min Z3-4, 2min recovery
42min total (3.5mi)
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