BENEFITS 益处
Strengthens spinal extensors (especially thoracic) and gluteal muscles; improves core control and coordination during dynamic flexion/extension transitions.
强化脊椎（特别是胸椎）伸展肌群和臀部肌肉力量；提高核心在动态屈伸转换中的控制能力与协调性。
TARGET MUSCLES 目标肌群
Erector spinae (primary spinal extensors), gluteus maximus and hamstrings (primary hip extension and lift), abdominals (eccentric control to protect lumbar, and participate in flexion phase), shoulder girdle stabilizers (supporting body).
竖脊肌（主导脊椎伸展）、臀大肌与腘绳肌（主导髋部伸展与上抬）、腹肌（离心控制以保护腰椎，并在屈曲阶段参与）、肩带稳定肌群（支撑身体）。
SETUP 设置
Same as Swimming, ensure corrector secure, abdomen at apex.
同Swimming，确保矫正器稳固，腹部位于顶点。
CUES 口令
Starting position: Same as Swimming prone. Breathing/Movement: Inhale, lengthen legs and trunk into extension. Exhale, engage core and back, rock body forward, bending elbows and knees, forming longest C-curve from head to toe. Inhale, extend legs back and up, straightening body. Exhale, control repeat. End in thoracic extension, legs long. Variation: At C-curve, keep knees bent, tap heels rapidly. Imagery: Body like a grasshopper coiling to jump, then exploding back and up; or like a drawn bow.
起始位：同Swimming俯卧起始位。 呼吸与动作：吸气，将腿与躯干充分延伸至伸展位置。吐气，启动核心与背部力量，使身体向前摇动，同时弯曲手肘与膝盖，让身体从头到脚形成最长的C字形。吸气，将双腿向后上方延伸出去，同时伸直身体。吐气，有控制地重复。以胸椎后仰伸展、双腿延长的姿势结束。变化式：在C字形位置，膝盖保持弯曲，进行脚跟的快速拍打。 想象提示：想象身体像一只蓄力起跳的蚱蜢，先蜷缩蓄力，再向后上方爆发伸展；或像一张被拉满的弓。
IMAGERY 意象
【Direct】Pelvic Anchor: On exhale, press the pubic bone deeply into the apex of the arc, creating a protective fulcrum for the lower back. Joint Space: As legs lift and beat, feel the femoral heads creating an outward traction within the acetabulum to avoid pinching at the hip crease. Scapular Organization: Use the downward pressure of the hands to spread the shoulder blades flat away from the spine, projecting the sternum forward. 【Indirect】Elastic Insect Antennae: Imagine your legs as two long, flexible insect antennae, sensitively probing the depth of the space behind you. Stable Capsized Boat: View your torso as a sturdy wooden boat floating upside down; the arc is the supporting water, keeping the hull level regardless of the leg beats. Pre-tensioned Fiber Rod: Imagine your spine as a pre-tensioned composite fiber rod, maintaining a perfectly rounded mechanical tension from crown to tail without any creases. 【Space】Piercing the Ceiling Crevice: Attempt to touch and pierce the seam where the back wall meets the ceiling with your big toes, maximizing your axial length. Sweeping the Hourglass: Imagine your legs sweeping through an invisible hourglass filled with fine dry sand, filling every corner of the space with movement. Filling Slope Shadows: On inhale, let the tension from your ribs fill the shaded area beneath the corrector's slope, making the body more three-dimensional. 【Feeling】Water Viscosity (Texture): Feel the air turn into resistant warm water; each leg beat requires a steady, slow pushing of water molecules. Taut Drum Skin (Tactile): Feel the skin at the front of your groins like a drum skin being evenly stretched, becoming smooth and resilient as the legs extend. Sound of Tightening Sails (Auditory): Capture the faint sound of 'sails tightening' deep in the lower abdomen to sustain deep core recruitment.
【直接】骨盆锚定：呼气时，将耻骨深深按入矫正器圆弧顶端，以此为支点为下背部建立保护屏障。关节空间：抬腿击打时，感受股骨头在髋臼窝内创造向外的牵引感，避免大腿根挤压。肩带组织：通过双手下压地板的力量，引导肩胛骨向脊柱两侧平整展开，维持胸骨向前投射。【间接】昆虫的弹性触角：想象双腿是两根细长且富有弹性的昆虫触角，正灵敏地向后方探测空间的深度。水面上的稳固木船：视躯干为一只倒扣在水面上的稳固木船，圆弧面是承载的水波，无论双腿如何拍动，船身始终水平。预张紧的复合纤维杆：想象脊柱是一根预张紧的复合纤维杆，从头顶到尾骨维持极致圆润的力学张力，无任何折痕。【空间】穿透墙缝的能量：尝试用大脚趾触碰并穿透房间后方墙壁与天花板交界的缝隙，拉开最长的身体中轴线。扫过隐形沙漏：腿部击打时，想象双腿正扫过一个装满干细沙的隐形沙漏内部，用动作填满每一个空间夹角。填满斜坡阴影：吸气时，感受肋骨产生的张力填满矫正器斜坡下方的阴影区域，使身体在三维空间更立体。【感觉】温水的均匀阻力（质感）：感受周围空气变得如同充满阻力的温水，每一次腿部交错需均匀缓慢地推开水分子。撑开的紧致鼓皮（触觉）：感受腹股沟前侧皮肤像一张正被均匀撑开的紧致鼓皮，随腿部延伸变得光滑且富有弹性。拉紧风帆的声响（听觉）：在下腹部深处捕捉极其轻微的‘拉紧风帆’声响，维持深层核心持续募集。
TACTILE CUES 触觉提示
During lift to extension, lightly place hands on sacrum and upper back, cue to lift. During C-curve, lightly touch lower abdomen, cue abdominal engagement to protect lumbar.
在练习者向上抬起至伸展位时，双手轻放在其骶骨和上背部，给予向上发力的触觉提示。 在形成C字形时，轻触其下腹部，提示腹肌参与以保护腰椎。
PROGRESSION 进阶
Add heel tapping to increase challenge to core stability and coordination.
加入脚跟拍打动作，增加对核心稳定性和协调性的挑战。
REGRESSION 退阶
Reduce rocking range; focus on controlled extension, omit large flexion (C-curve) phase.
减小前后摇动的幅度；专注于有控制的伸展，省略大幅度的屈曲（C字形）阶段。
COMMON ERRORS 常见错误
Shoulder tension; using lumbar as hinge to drive movement (causing low back pain); head/chest dropping; face too close to floor; lack of active thoracic extension.
肩膀紧张；用腰椎作为凹折点来推动动作（导致腰痛）；头和胸部下垂；脸部过于靠近或碰到地面；缺乏胸椎的主动伸展。
PRECAUTIONS 注意事项
Avoid for acute lumbar disc herniation, spondylolisthesis, osteoporosis; caution for neck discomfort; caution or avoid for hypertension, glaucoma (head may be below heart).
腰椎间盘突出急性期、脊椎滑脱、骨质疏松者应避免；颈部不适者慎做；高血压、青光眼患者（因头部可能低于心脏）需谨慎或避免。