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Core exercises (planks, etc) can strengthen core.
None of these will fix a hernia. Goal is to prevent them from coming out less often by strengthening the abdominal wall therefore making the hernia defect have less laxity and change the contour of the defect to be less accommodating
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Also, avoiding smoking and strive for weight loss to decrease fat on intestines to lower intra-abdominal pressure to prevent abdominal contents from pushing into them. High fiber diet and lots of water to making defecation less stressful and require less abdominal pressure.