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. 2016 Dec 8;10:626. doi: 10.3389/fnhum.2016.00626

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Copyright © 2016 Stillman, Cohen, Lehman and Erickson.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Conceptual model of mechanisms of physical activity (PA) at multiple levels of analysis. There are various possible mediating pathways and bidirectional effects. Several possibilities are denoted with dotted arrows.