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In this segment, the presenter critiques the effectiveness of the parallel‑bar leg‑raise for abdominal training. He explains that because the exerciser leans back against the bars, the spine does not flex during the movement, eliminating the high demand on the abdominal muscles. Consequently, the abs serve mainly as stabilizers while the hip‑flexor group—particularly the rectus femoris and iliopsoas—perform the majority of the hip‑flexion work. This biomechanical analysis underpins his claim that the exercise is largely useless for targeting the core.
