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Originally Posted by EmptyneSs use a medicin ball. lay on ur back and drop the medicine ball on ur stomach again and again to toughen it up. |
Those are excellent for that. Also, try vaccuums. They strengthen your internal obliques and whenever you tighten up your stomach it'll be much tougher. Rocky Marciano used to do them every day and he often let his opponents punch him in his cast-iron stomach cause "it tires them out."