Col. Mark Ellis, Expeditionary Operations School commandant at the U.S. Air Force Expeditionary Center performs push-ups in the EC command section during the Center's Ground Up Fitness Challenge at Joint Base McGuire-Dix-Lakehurst, N.J. recently. Students and faculty at the Expeditionary Center perform sets of pushups and sit-ups at designated times each day as part of the organization's overall commitment to installing a commitment to fitness. (U.S. Air Force photo by Staff Sgt. Zachary Wilson/Released)
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