RecruitingClinical trialExercise in Prematurely Born Preadolescents to Mitigate Cardiovascular Risk and Improve Cognitive ImpairmentEXCELSIOR is a randomized controlled trial to investigate the effect of physical exercise on cardiovascular health in prematurely born children. Participants will be randomly allocated to either an intervention group or a control group. The intervention will receive a child-friendly physical exercise program and the control group will receive age appropriate lifestyle- and exercise recommendations.