Footnotes

• X @janesthornton

• Contributors JST conceived of the idea. JST and RB wrote the original draft, reviewed and edited subsequent drafts and approved the final manuscript. JST is the guarantor.

• Funding JST holds a Canada Research Chair in Injury Prevention and Physical Activity for Health funded by the Canadian Institutes of Health Research.

• Competing interests JST is an Editor of the BJSM.

• Provenance and peer review Not commissioned; externally peer reviewed.