Jackknife Sit-Up
- Body part
- Waist
- Target muscles
- Primary muscles
- Secondary muscles
- Not listed
- Equipment
- No equipment — bodyweight
- Sports fields
How to perform it
Lie flat on your back with your legs extended and your arms overhead. Engage your core and lift your legs and upper body simultaneously, reaching your hands towards your toes. Pause for a moment at the top, then slowly lower your legs and upper body back down to the starting position. Repeat for the desired number of repetitions.
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Work out how much you should be lifting or eating around this movement with the Dambel fitness calculators.
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