There is no shame in walking some of heartbreak hill.... It is bloody tough.
I ran this race every year from when I was 12 till 19, with my best time being 70m2Xs
Haven't ran it since, but I have a feeling if I was running this weekend I'd be struggling to crack 100m such is my fitness these days.
I've got the Sutho to surf and City to surf circled next year though in my bid to run a marathon before I turn 27 (it used to be 25 but I've been lazy)