Transplant children give thanks at start of Sheffield games
16 August 2013 Last updated at 12:06 BST
As the British Transplant Games start, children who are transplant recipients explain why donors are so important.
The children and their family have spoken about the difference an operation can make.
More than 650 competitors who have had life-saving transplants have arrived in Sheffield, South Yorkshire to take part in sports including archery, football, tennis and athletics over four days.