Footnotes

• Contributors All authors except KN were involved with the design and conduct of the motion capture research. MAE provided all biomechanical analysis. All authors contributed to the final writing of the report.

• 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 None declared.

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