Did a 20,1 km race in 1:23:51 yesterday: extrapolated that‘s 1:28 on a HM. I am definately not capable on other shoes to do a sub 1.30 HM: last year on a fast course I did 1.31 with which I was very happy. Yesterday the course was not slow but not really fast either: 8 small climbs on bridges.
So 3 minutes faster: I’m sorry but that‘s 4%.
I am a heel runner, so I think the shoe is particularly generous to me.
Crazy, feel 35 years younger, was racing with people I normally see only at the start.