How to do the Band Jack Knife Sit-up
Band Jack Knife Sit-up is a beginner single-joint isolation pushing exercise targeting the Abs in the Waist region. Performed using band, it falls under the strength category. Secondary muscles engaged include Hip Flexors.
Band Jack Knife Sit-up demonstration · © GymiaFit
Band Jack Knife Sit-up at a glance
- Primary muscles
- Abs
- Secondary muscles
- Hip Flexors
- Equipment
- Band
- Level
- Beginner
- Type
- Isolation (single-joint)
- Force
- Push
Band Jack Knife Sit-up step by step
- 1Lie flat on your back with your legs straight and your arms extended overhead, holding the band.
- 2Engage your abs and lift your legs and upper body simultaneously, bringing your hands towards your feet.
- 3Pause for a moment at the top, then slowly lower your legs and upper body back down to the starting position.
- 4Repeat for the desired number of repetitions.
Band Jack Knife Sit-up — questions
What muscles does the Band Jack Knife Sit-up work?
The Band Jack Knife Sit-up primarily targets the Abs. It also recruits the Hip Flexors as secondary movers.
What equipment do I need for the Band Jack Knife Sit-up?
You need band. If your gym does not have it, the alternatives listed further down train the same muscles with different kit.
Is the Band Jack Knife Sit-up suitable for beginners?
Yes. It is classed as a beginner movement: the pattern is simple enough to learn in a session and easy to scale by adjusting range of motion or load.
What can I do instead of the Band Jack Knife Sit-up?
Band Alternating V-up, Band Assisted Wheel Rollerout, Band Bicycle Crunch train the same muscles and make good substitutes when the equipment is taken or the movement does not suit you.
Log it, don't guess it.
The GymiaFit app has the Band Jack Knife Sit-up demo, form cues and set logging built in — plus a muscle map that shows what you have actually trained this week. Free on iOS and Android.