 Complete the following phrase:  Okkert Brits born 22 August 1973, in Uitenhage is a former South African track and field athlete who specialised in the pole vault. He was the silver medallist at the World Championships in Athletics in 2003. He was a four-time champion at the African Championships in Athletics and twice champion at the All-Africa Games. He was a gold medallist at the 2002 Commonwealth Games and took bronze at the 