Jackknife Sit-Up

GymDaze demonstration

Watch Jackknife Sit-Up

Technique

How to perform Jackknife Sit-Up

1. Lie on your back with your legs extended and your arms reaching behind your head.
2. Brace your abdomen and begin with your lower back supported rather than arching as your limbs lengthen.
3. Raise your legs as you curl your torso upward, bringing your hands toward your feet.
4. Keep your knees mostly straight and reach into a V-shaped position without throwing your arms for momentum.
5. Lower your trunk and legs together under control, then repeat while maintaining abdominal control.

Programming relevance

Muscles involved

Primary targets: Rectus Abdominis.

Calisthenics graph

Progression relationships

These relationships describe graph position, not personal readiness.