Footnotes

• Twitter @CarlosRam88, @ktconditioning, @ajboyd83, @EliteSC7, @JPiscione, @samabradley, @CLeduc13, @23benjones

• Contributors CR-L adapted the theory and developed the framework. KT, AB, MB, JP, SB, PG, CL and BJ made substantial contributions by discussing, challenging and further developing the original ideas. All authors critically revised the manuscript for important intellectual content.

• 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; internally peer reviewed.