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. 2018 Dec 13;4:55. doi: 10.1186/s40798-018-0169-5

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© The Author(s). 2018

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 1 — A typical flywheel machine. Pictured is YoYo™ Ultimate Squat (model #215) with Hooper’s Box. Courtesy by nHANCE™ driven by YoYo™ Technology—Copyright© 2018. All rights reserved