(FILES) A file photo taken on August 28, 2018, shows eight-time Olympic champion Usain Bolt heading the ball as he trains with A-League football club Central Coast Mariners in Gosford. Usain Bolt is set to get a first taste of competitive football on August 31, 2018 in a much-hyped game, but the sprint superstar admits he is nervous with his fitness levels not up to scratch. / AFP PHOTO / Saeed KHAN / -- IMAGE RESTRICTED TO EDITORIAL USE - STRICTLY NO COMMERCIAL USE --
