U.S. Marine Corps photo by Lance Cpl. Manuel F. Guerrero/Released 100224-M-2906G-020.jpg
Feb 24, 2010
Gunnery Sgt. Mark Rivers, the administrative chief for Marine Medium Tiltrotor Squadron 161, uses a medicine ball to balance himself whlie doing mountain climbers during the Ultimate Warrior Challange, Feb. 24. The workout is designed to increase heart rate to burn additional calories in a one-hour span.
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