Authors’ contributions
B.S. initiated and directed the FitMum study. C.B.R., S.dP.K., J.B., T.D.C., S.M., S.A.A., E.L and B.S. developed the study protocol. C.B.R., S.dP.K., A.D.A., N.B. and I.K.B.J. conducted intervention activities and collected data assisted by S.A.A., research assistants and master students. E.L. is the clinical trial manager and supervised the clinical part of the study in collaboration with J.B., T.D.C., S.M., and B.S. T.D.C and E.L. supervised analysis of data and writing of the manuscript, and A.K.J. performed and supervised statistical analyses. C.B.R. analyzed data and drafted the manuscript. All authors read, contributed to, and approved the final version of the manuscript.