Jackknife / Corkscrew
Plane of Motion
Jackknife: Sagittal; Corkscrew: Sagittal, Coronal & Transverse
Spring Setting
Medium / Heavy
2 Springs on Mid Hooks
Muscle Focus
Spinal Flexors
Rectus Abdominis, Internal Oblique, External Oblique
Spinal Extensors
Erector Spinae, Semispinalis, Deep Posterior Spinal Group
Hip Flexors
Iliopsoas, Rectus Femoris, Sartorius, Tensor Fasciae Latae, Pectineus
Objectives
Develops abdominal strength and control while engaging the muscles of the hips, back, and shoulders.
Enhances torso stabilization and increases the ability to articulate the spine with control.
Stabilizes the scapulae while the spine moves into flexion. Improves balance and promotes coordinated, sequential muscle activation for efficient movement.
Improves flexibility and neuromuscular control of the lower‐back muscles.
Increases hamstring flexibility to support balanced movement patterns.
Focus on breathing to synchronize the movement.