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By A.C. Shilton for Men’s Journal

Treadmills are miserable machines. There’s no scenery or fresh air and time just crawls on them. But where there’s misery, there’s money to be made, and app designers and treadmill manufacturers are on it. Search the iTunes store for “treadmill apps” and you’ll find everything from motivation via zombie apocalypse, to famed Olympic runner Jeff Galloway speakin…