"The roll-out and pike were the most effective exercises in activating upper and lower rectus abdominis, external and internal obliques, and latissimus dorsi muscles, while minimizing lumbar paraspinals and rectus femoris activity."
Translation: The exercise forces your abdominals to work the hardest while your lower back and hip flexors -- areas that can take over in other traditional ab exercises -- are almost completely left out. So while a crunch works your abs but only with help from other areas, the roll-out pike isolates your abs much more effectively. -Source-
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