Usain Bolt shunned the media after training on Thursday, two days before he takes to the track at the world championships, but coach Glen Mills said the sprinter was motivated, healthy and "in good shape to run very well".

The distinctively tall figure of Bolt, dressed in a black, yellow and green Jamaican T-shirt, strode around the sunbaked training track in Moscow in front of a crowd of fans and journalists.

As some of his team- mates came over to talk to the media, the triple Olympic champion in 2008 and 2012 put on headphones and walked across the infield in the opposite direction, pausing only to greet other athletes on his way.