How to do the Jackknife Sit-Up
- 1Lie flat on your back with your arms extended overhead and your legs straight.
- 2Simultaneously lift your legs and torso towards each other, aiming to touch your toes with your hands.
- 3Engage your core throughout the movement.
- 4Slowly lower your legs and torso back to the starting position.
Muscle group
Core
Type
Reps Only
Equipment
None needed
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