ADVANCED FOR USE SUNDAY FEB 8 AND THEREAFTER David Vobora owner of Performance Vault shows James Castleman how to tweak his running technique during a workout at Performance Vault in Dallas, on Friday, Jan. 23, 2015. Castleman is a defensive lineman at Oklahoma State University and NFL prospect. (AP Photo/The Dallas Morning News, Vernon Bryant) MANDATORY CREDIT, NO SALES, MAGS OUT, TV OUT, INTERNET USE BY AP MEMBERS ONLY
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