Footnotes

• Contributors TJG and RON proposed and drafted the initial paper. All coauthors provided input to subsequent drafts of the paper.

• Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.

• Competing interests TJG works as a consultant to several high-performance organisations, including sporting teams, industry, military and higher education institutions. He serves in a voluntary capacity as Senior Associate Editor of BJSM.

• Patient consent Not required.

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