Last-minute instructions shout above the music across the PA but I just hear the music and the chatter and laughs of the crowd around me.
Suddenly the mass of people in front starts to move forward: first it's a slow walk and the pace gradually quickens to a jog. It will be some time before I'm running at normal speed.
Starting near the back means I have to swerve and sidestep around slower runners and walkers. It's tricky going around the kerbs and traffic islands of Devonport.
I'm soon running in a pack of similar speed and, as we climb the first hill before Narrow Neck beach, the chatter quietens to the sound of heavy breathing and the pad of hundreds of runners sounding like the heavy drops of a summer shower.
Bleary-eyed parents have been dragged roadside by their eager young to watch the Sunday warriors battling it out on the suburban streets. Young hands reach out and I high-five a line of fans, feeling like I've just finished an Olympic marathon. But this is only the 5km mark.