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Sit-Ups Can Hurt Your Back: A Smarter Way to Train Core: How Hip Flexors, Pelvic Position, and Exercise Choice Affect Lower-Back Comfort: Build Strength with Pain-Smart Alternatives

Name: Sit-Ups Can Hurt Your Back: A Smarter Way to Train Core: How Hip Flexors, Pelvic Position, and Exercise Choice Affect Lower-Back Comfort: Build Strength with Pain-Smart Alternatives
Brand: Independently Published
SKU: c9551fc9409506ad90a9e5b769f02bce

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Sit-Ups Can Hurt Your Back: A Smarter Way to Train Core: How Hip Flexors, Pelvic Position, and Exercise Choice Affect Lower-Back Comfort: Build Strength with Pain-Smart Alternatives