Editor's note: Your gym may be bare-bones and monochromatic or super-posh with spa-water stations and those fat, high-thread-count Egyptian towels everywhere. It doesn't matter, because the gorgeous thing that's going to come out of that gym is YOU. Get a gym wallpaper as a reminder that your body will never get hotter while sitting in front of a computer (sorry). Now go, choose one! You'll be glad you did.