A bizarre video has emerged from Austria of a Bosnian taekwondo champion using his head to smash 90 concrete (siporex) slabs in just 25 seconds.

In the unusual clip, which was filmed on June 10, Kerim Ahmedspahic somersaults into each pile of slabs and headbutts them hard, driving a crack right down the middle.

The filmer claimed that the feat was a new Guinness World Record.