<https://www.healthstatus.com/health_blog/health-fitness/six-signs-that-indicate-you-have-a-weak-core/#primaryimage>
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"Female athlete lower back painful injury. Caucasian fitness girl gripping her lowerback because sport injury after exercising and running."
<https://www.healthstatus.com/health_blog/health-fitness/six-signs-that-indicate-you-have-a-weak-core/>