Col. Mark Casto, vice commander of the 932nd Airlift Wing, is tasked with working fitness improvement awareness at the Illinois Air Force Reserve unit. He shares his thoughts on stretching and demonstrates how to avoid obstacles and stay safe along the way by working on the "core" of the body. Capturing his ideas and suggestions to video is Tech. Sgt. Gerald Sonnenberg. The colonel enjoys working out in a variety of locations. (U.S. Air Force photo/Maj. Stan Paregien)