Time Out says
Face your fears and run head-first down a building
Never heard of rap jumping? Basically think of rock climbing, then flip it and reverse it. No, really – instead of climbing up a wall, rap jumping (or forward-facing abseiling) involves running down one face-first, from a great height. In Melbourne you can get your death- and gravity-defying fix from Rap Jumping, who send people sprinting off buildings from Urban Central budget accommodation in Southbank.