Two boys stand toe to toe, preparing to fight for a prize only one can win.
The parents of both boys are unusually quiet, and neither of the young competitors can hear their name being cheered above the noise of the crowd.
This is a situation which has become a common dilemma for Helen Taylor, from Lincoln, as her twin boys Jack and Thomas begin to make their mark in the semi-contact sport of Tae Kwon Do.
The 13-year-old twins have been forced to fight against each other in competitions over the last few weeks.
In the North Midlands Tae Kwon Do Championships, in Derby, Jack beat his brother in the final as they took gold and silver respectively.
However, the previous week Thomas triumphed as he beat his brother on the way to the gold in the final at the Midlands Championships in Kettering.
While the boys might enjoy the occasional meeting in competitions, for mum Helen, it brings a moment of dread as she deals with the emotional turmoil their competition battles bring.
"My hands shake and I do find myself biting my nails," explained Helen. " I sometimes feel like those women you used to see on TV at the wrestling on a Saturday afternoon.
"It is nerve-wracking, but to be honest I am more nervous when they are fighting other people. Obviously I don't want either of the boys to lose, but whoever wins, the other one is always very sporting about it.
"When they meet each other in a competition, you think 'oh no, how will it be for whoever doesn't win?'
"But they want to do it, so we support them. They really enjoy the sport and they both have the bug for competing."
The boys, who both attend the Priory Witham Academy, in Lincoln, took up the sport following an incident which left Jack with a black eye just over three years ago.
Having recently moved to the area, the lads visited the local park and were watching a group of boys who were performing tricks on skateboards.
"They were attacked for no reason," explained Helen. "Jack was put in a headlock and punched. It really upset them both and they wanted to be more confident in situations like that.
"No one wanted them to learn a martial art so they can go out and use it to hurt people, but it's important they are confident in defending themselves if they need to."
The twins have been members of the Lincoln South Tae Kwon Do Club, based at Moorlands Community Centre.
They practise the TAGB (Tae Kwon Do Association of Great Britain) version of the sport and, after three years, have each reached blue belt level.
Thomas and Jack will be in action again at the British championships in Coventry in November.