where n=3

400m x3.

josey:
1:41
1:48
1:46

daddy-o:
1:26.9 (max HR 185)
1:30.1 (186bpm)
1:29.4 (186bpm)

we don't do anything crazy like have equal rest/work ratios. we walk back to the start and go (about 6minutes - i know you scoff hedda!)