Master Sgt. Wayne Birk, 436th Maintenance Squadron resource advisor, performs flutter-kicks during a “90+” workout Oct. 15, 2014, at the Fitness Center on Dover Air Force Base, Del. Birk is one of many Airmen who has transitioned from the old “90n90” program to the new “90+” program. (U.S. Air Force photo/Airman 1st Class William Johnson)
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