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Correction notice This article has been corrected since it published Online First. A typographical error in figure 1 has been corrected.
Contributors TG and IS drafted the initial manuscript. All authors contributed equally to subsequent versions of the manuscript.
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 TG 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.
Provenance and peer review Not commissioned; externally peer reviewed.
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