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In an undated handout image, a screenshot of the Zombies, Run! app. The running app combines traditional fitness tracking with audio stories and motivational goals that push you to run ahead of an advancing zombie horde. (Handout via The New York Times) -- NO SALES; FOR EDITORIAL USE ONLY WITH CIR SMARTPHONE APPS BY KIT EATON FOR JAN. 19, 2017, 2017. ALL OTHER USE PROHIBITED. -- - XNYT172