Did a quick run on my old route in Vienna. A nice 6k run around the ring. Doing this I just realised what a big effect the altitude has. Joburg being 1500-1600m above sea level is a great place to build lung capacity. Plus you have all the hills in Bryanston.
Being back in flat Vienna at low altitude is awesome and the race will be too.
Can’t wait two more nights to go!