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3. Fewer headaches
Headaches are a common by-product of our constant use of computers and other electronic gadgets notice how gravity draws your head forward when you're staring at a screen. Trouble is, that position pulls on neck muscles and sensitive nerves in the back of your head and cuts blood flow to the brain. The result: a throbbing noggin. Sit straighter and you'll prevent the pain.
4. Fewer bone and joint aches
Poor posture can be a slowly occurring injury that can lead to the shortening of muscles over time, says Mara Vucich, D.O., an osteopathic doctor at Mercy Medical Center Hospital in Baltimore. For example, slouching when you're sitting causes hip flexors to become shorter and less flexible than they should be, leading to joint pain. And if you sit with rounded shoulders, you may get rotator-cuff pain. Over time, this wear and tear can lead to arthritis.
5. Better digestion
Slouching on the sofa after eating causes your tummy muscles to tighten, which can push stomach acid into your esophagus and cause heartburn. Standing or sitting up straight allows your digestive system to work more efficiently, so you won't experience that or other gastro problems, like gas.