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Top 5 Core Workouts to Absolutely Demolish Your Abs You want abs that look carved out of stone? Stop wasting time and start training like it matters. Here are five core exercises that hit deep, burn hard, and actually build a powerful midsection. Number one. Hanging leg raises. No swinging, no cheating. Control the movement, bring your legs up, and squeeze at the top. This hits your lower abs like nothing else.