Ab Squeeze

AbWork in an open space where you have to be extra sneaky about your exercises? Try practicing your posture and you'll be getting a perfect ab workout. Sit up straight, keep your shoulders back and chest out, and hold for as long as you can. Eventually, this posture will become habit, and you'll be able to type away at your computer without even noticing you're working your abs. [Photo via @asteronlife]
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