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Have you ever why children always to have bags of energy and never out of steam? Researchers have that children the stamina and levels of recovery of endurance athletes. In fact, scientists say children's muscles from "high-intensity exercise" a lot quicker than athletes. A study looked at the performance levels of children when they were , and compared their fitness to that of athletes. Researcher Dr Sebastien Ratel said: "We the children used more of their aerobic metabolism and therefore less tired during the high-intensity physical activities. They also recovered very quickly - even faster than the well- adult endurance athletes."

The researchers hope that their findings will scientists better how the human body changes with age. It could to advances in the fight against diabetes and other diseases. Dr Ratel said the research was particularly important as more children were less active. He warned: "With the rise in diseases related to physical inactivity, it is helpful to the physiological changes with growth that might to the risk of disease." He added that children should their fitness as they grow up and play as much as they could so they healthy as adults. He said: "Children seem to have the ability to play and play and , long after adults have tired."