PurposeTo investigate the effects of the “11 for Health” programme on musculoskeletal fitness.MethodsA total of 108 Danish children aged 10–12 years participated in the study, with 61 children in the intervention group (IG, 25 girls and 36 boys) and 47 children in the control group (CG, 21 girls and 26 boys). Measurements were conducted before and after an 11-week intervention consisting of twice-weekly 45-min football training sessions for IG or continuation of normal Physical Education program for CG. Whole-body dual X-ray absorptiometry was conducted for evaluation of leg and total bone mineral density as well as bone, muscle and fat mass. Standing Long Jump and Stork balance tests were employed to assess musculoskeletal fitness and postural balance.ResultsDuring the 11-week study period, leg bone mineral density as well as leg lean body mass increased more (p< 0.05) in the intervention group (IG) compared to the control group (CG) (0.021 ± 0.019vs0.014 ± 0.018 g/cm2and 0.51 ± 0.46vs0.32 ± 0.35 kg, respectively). Moreover, body fat percentage decreased more in IG than in CG (−0.6 ± 0.1vs0.1 ± 0.1 %-points,p< 0.05). No significant between-group differences were found in bone mineral content. Stork balance test performance increased more in IG than in CG (0.5 ± 2.6vs−1.5 ± 4.4 s, p < 0.05), whereas no between-group differences were found in jump performance.ConclusionsThe school-based football programme, 11 for Health, with twice-weekly 45-min training sessions over 11 weeks improves various, but not all evaluated parameters related to musculoskeletal fitness in 10–12-yr-old Danish school children.