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Blumenthal JA, Smith PJ, Hoffman BM.Blumenthal JA, et al. Among authors: hoffman bm.ACSMs Health Fit J. 2012 Jul;16(4):14-21. doi: 10.1249/01.FIT.0000416000.09526.eb.ACSMs Health Fit J. 2012.PMID: 23750100Free PMC article.