The Jack Knife exercise primarily works on which aspect?

The Jack Knife exercise primarily targets core stability. This exercise is designed to engage the muscles of the abdominal region, promoting strength and control in the core. During the execution of the Jack Knife, the individual must stabilize their torso while using the upper body and legs to create a controlled motion, which emphasizes the importance of core strength in maintaining proper alignment and balance throughout the movement.

While bridging, rotation, and flexibility may also incorporate elements of core engagement, the main focus of the Jack Knife is to enhance stability from the core. This foundational aspect of Pilates is crucial for overall body coordination, control in various movements, and injury prevention. Strengthening core stability ultimately supports the other aspects of body movement, which is why the Jack Knife is considered a key exercise in that regard.