References:
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2.http://users.speakeasy.net/~wrayre/pubs/VariabilityinHumanBehaviorModelingWrayLairdBRIMS2003.pdf
3.Stergiou, N., Harbourne, R., & Cavanaugh, J. (2006). Optimal movement variability: A new theoretical perspective for neurologic physical therapy. J Neurol Phys Ther., 30(3), 120-129.
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6.http://www.functionalmovement.com/articles/research/2011-03-07researchstatementandreview (literature review on the FMS: screen for looking at more optimal movement patterns)
7.http://www.webster-dictionary.net/definition/variability
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