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VIDEO: Sitting all day? This one stretch can relieve your lower back pain 3:49

Hamstring tightness is one of the most common complaints I hear from athletes, everyday exercisers and desk workers alike. No matter how much you may try to stretch, the tightness doesn’t go away.

And the reason may surprise you: In many cases, “tight” hamstrings aren’t caused by a lack of flexibility — the muscles are tensing in response to instability in other areas.

And until you address the root cause, all the hamstring stretching in the world won’t fix the stiffness.

In my work with professional athletes, I’ve found that tight hip flexors and weak glutes are most often the culprits,

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