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In this instructional fitness video, Eric Roberts demonstrates two key adjustments to improve the effectiveness of sit‑ups and reverse crunches. First, he places an ab‑mat under his stomach, explaining that the added cushioning allows a deeper stretch of the abdominal muscles at the bottom of the movement, increasing range of motion and promoting more defined abs. Second, he anchors his feet against a bar, which activates the hamstrings and suppresses the hip flexors, preventing the front of the thighs from taking over the effort and allowing the core to do more work. He asserts that applying these two tweaks leads to better core activation, reduced thigh burning, and faster progress toward visible abdominal definition.
