The purpose of this study was to examine the acceptability to students, parents and teachers of a school-based intervention that incentivised students using prizes to be more physically active (the B-Active program). Three hundred and eighty-five children (54% boys, 46% girls) in Years 3 – 6 from five schools participated in the study. Six parents and three teachers were also interviewed about their perception of the B-Active program. Overall, the students enjoyed the B-Active program but the level of acceptability was lower for the parents and teachers. This study indicates that to increase acceptability, parents need to be well informed and engaged and teachers need to be well supported so as to not add to their administrative responsibilities.