Jackknife Sit Up

Simultaneously raise your torso and legs to touch your toes at the top, forming a V-shape.

Quick facts

Primary and secondary muscle groups targeted by this movement.

AbsHip Flexors

Deep Abs / CoreSide Abs / Obliques

What you need and how to position yourself before starting.

Body Weight

Bilateral

Lying

reps

Follow these cues to master proper technique and stay safe through every rep.

Step 1Setup
- Lie face up on a mat with legs straight and arms extended overhead.
- Keep your lower back pressed into the floor.
Step 2Starting Position
- Arms are behind your head, legs are flat on the ground.
- Engage your core before initiating the movement.
Step 3Execution
- Simultaneously raise your upper body and legs off the ground.
- Reach your hands toward your toes, forming a V-shape.
- Keep your legs as straight as possible throughout.
- Pause briefly at the top with your abs contracted.
- Lower both your torso and legs back to the floor under control.
- Avoid using momentum to swing up.

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