6 x 5mins off 1 min on the track. Doing just under one mile each rep, getting a little bit further each time (up to a mile by the end). Had about 80 seconds extra rest between the 5th and the 6th reps so was on my own for the last one.
Garmin has deleted the file for some reason but I forgot to wear my hr strap so couldn't tell if I was on threshold or not. Felt about right, getting hard on the 5th and 6th reps.