U.S. Air Force 2nd Lt. Sarah Kline, a vehicle management and analyst officer assigned to the 99th Logistics and Readiness Squadron, drinks water during physical training at Nellis Air Force Base, Nev. Staying hydrated while engaged in physical activity helps the body cool off, regulate the body's temperature and lubricate joints and tissues. This is especially important when participating in outdoor activities in the sun. (U.S. Air Force photo by Senior Airman Brian Ybarbo)
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