In fact, there is a lot of evidence that there is a link between physical activity in childhood and adulthood. Overweight children show the greatest risk of being overweight in adulthood. In their study, Stark and Steel also found that 40.0% of men and 48.6% of women who were obese by the age of 18 and had already been obese by the age of 7 (1). Further evidence can be found in the difference between the KIGGS basic survey and the second KIGGS survey: 86% of children who were not overweight by 6-7 years maintained a normal weight and only 13% of those children developed overweight or obesity between 12 and 17 years.