Physical Fitness and Body Composition in 8-10-Year-Old Danish Children Are Associated With Sports Club Participation.

"The authors thank the participating pupils, teachers, and schools in Frederikssund and Copenhagen for their contribution, as well as Frederikssund Municipality for its collaboration and support. Special thanks to Henrik Pedersen and Therese Hornstrup for their excellent technical assistance. Also, special thanks to Ida Elkjær, Jan R. Jacobsen, and Henrik Oksholm for their assistance during testing sessions. In addition, this study was supported by the FIFA Medical Assessment and Research Center (F-MARC), the Danish Football Association (DBU), KFU, Aase and Ejnar Danielsen's Foundation, and the Augustinus Foundation. The Copenhagen Center for Team Sport and Health is supported by a grant from the Nordea Foundation (Nordea-fonden). The foundations did not participate in the analysis, interpretation, or writing of the paper."