Marcus Grothues, 786th Force support Squadron fitness and sports manager, demonstrates how the Sports Art cross-trainer generates energy to be sent back into the power grid during the ribbon cutting ceremony at the Northside Fitness Center on Ramstein Air Base Germany, April 23, 2021. The Sports Art equipment utilizes ECO-POWR, which harnesses up to 74% of human energy and converts it to utility grade electricity for use in the facility. (U.S. Air Force photo by Staff Sgt. Leah Ritchey)
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