U.S. Marine Corps photo by Lance Cpl. Crystal Druery/Released 111006-M-0000L-001.jpg
Oct 6, 2011
Gene Calantoc, Semper Fit personal trainer, performs basic crunches during an abs class at the Marine Corps Recruit Depot San Diego Semper Fit Center. Calantoc leads participants through a variety of abdominal exercises using different equipment, targeting different core muscles Monday through Thursday. Having a knowledgeable instructor can make it easier for some people to achieve their fitness goals.
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