Quick anatomy refresher: Your core is the set of muscles that connect your upper and lower body. It includes everything from your hips, abs, and gluts to your back and pelvic floor muscles.No surprise, then, that any weakness or restricted range of motion in your core can set off a chain reaction of stiffness and pain—and even set you up for injury. Your hips might feel tight, your shoulders might ache, and your back might feel stiff and sore.
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