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You don't need sit-ups — 3 ab exercises that build a stronger core using a Swiss ballAnyone attempting to balance on a big inflatable bouncy rubber ball for any length of time can ... abdominis (a belt of deeper core muscles that sit beneath the abs). Proper form is crucial ...
Which balance ball chairs are best? Sitting incorrectly can cause discomfort and affect your posture. Sitting on a balance ball by itself can be beneficial when sitting correctly, but it can be ...
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