Footnotes

• Contributors All authors drafted, revised and approved the final version 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 BMN is the founder and Chief Science Officer of Biomechanigg Sport & Health Research (BSHR) and SRN is the owner and Chief Executive Officer of BSHR. BSHR is a biomechanics consulting company, where past and present research projects have been funded by Adidas, Salomon Group, On AG, Li-Ning, Mizuno and Brooks Sports.

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