“Core strength” is more than just a fitness buzz term to remind you that you probably don’t do enough sit-ups. Core strength actually refers to the strength of deep muscle groups in your abdomen, back, and glutes — the three muscle groups that are essential to supporting your spine and helping you maintain your balance. …

“Core strength” is more than just a fitness buzz term to remind you that you probably don’t do enough sit-ups. Core strength actually refers to the strength of deep muscle groups in your abdomen, back, and glutes — the three muscle groups that are essential to supporting your spine and helping you maintain your balance. …

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