Statistical analysis:
Using SPSS (version 17.0.3), the following datasets were analysed:
1. All participants (n=399).
2. Participants who completed the challenge (n=264) versus participants who dropped out of the challenge (n=135)(participants who did not complete the follow-up survey).
3. Comparison of the three occupational group datasets (nursesand doctors versus allied health and other professionals; nurses and doctors versus administrative services and non-professional support services; and allied health and other professionals versus administrative and non-professional support services).
4. Before and after challenge datasets from the participants whocompleted the challenge (n=264).
5. A subset of active participants (≥150 min physical activity per week at baseline) and inactive participants (