“…Assuming that such programmes are relatively safe, efficient (eg, no individual screening, team-based training and no costs for equipment) and, most importantly, can be implemented and sustained on a wide scale, then these findings might be important. However, the extent to which the results from efficacy or effectiveness studies might be extrapolated to the real sport world remains to be further elucidated 10. The studies evaluated here focused on competitive young athletes engaged in ball sports only, and all were engaged either in school teams or clubs organised by professional sports leagues.…”