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Twitter Follow Paul Kelly at @narrowboat_paul, Justin Richards at @JRLovesCycling and Nanette Mutrie at @nanettemutrie
Authors' note This Editorial is based on “An open letter: 12 reasons why “The physical activity myth” paper should not have been published” that can be read in full here http://bjsm.bmj.com/content/49/15/967/reply#bjsports_el_13981
Contributors PK, CM, GB and NM conceived the letter. MM, CF, KM and JR provided critical feedback. All authors helped write the final version.
Competing interests We declare that we have an interest in physical activity research, public health and the maintenance of the highest academic standards. We receive funding from a number of national and international research councils, and companies that manufacture physical activity measurement devices.
Provenance and peer review Not commissioned; externally peer reviewed.