THOMPSON WR. Now trending: Worldwide Survey of Fitness Trends for 2014. ACSM'S Health & Fitness Journal 2013; 17 (6): 10-20.
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http://journals.lww.com/acsm-healthfitness/Fulltext/2013/11000/Now_Trending__Worldwide_Survey_of_Fitness_Trends.5.aspx
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