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Sit up straight! Don’t slouch! We all heard those words as children—and maybe even more recently. It’s easy to get into a slumping position at your desk. And at home on the couch? Forget about it. But good posture has its benefits—less lower back pain, fewer headaches and improved breathing, to name three. Improve yours in five ways, but don’t worry. None of them includes walking down the stairs with a phone book on your head.