Series Two 连载二
You engage the upper portion of the rectus when you flex your torso forward while keeping your legs stable, as in Paschimottanasana (Seated Forward Bend). 在坐立前屈伸展式（Paschimottanasana）中，当你保持双腿的稳定，前弯躯干时，就锻炼到腹直肌的上半部。Conversely, you engage the lower portion of this muscle by raising your legs while maintaining a stable torso, as in Urdhva Prasarita Padasana (Upward Extended Foot Pose, Leg Raises;)相反地，在做抬腿伸展体式（Urdhva Prasarita Padasana）时，抬起双腿的同时保证上身稳定，这可以锻炼到腹直肌的下半部。
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