Jackknife sit-up
The jackknife sit-up is a bodyweight exercise targeting the abdominal muscles. It involves lying on your back and simultaneously raising your legs and torso to meet in a 'V' shape, engaging the core throughout the movement.
At a glance
- Area
- Waist
- Main muscle
- Abs
- Equipment
- Body weight
- Level
- Intermediate
Form tips
- Keep your core engaged throughout the movement.
- Avoid using momentum to lift your legs and torso.
- Exhale as you lift and inhale as you lower.
- Maintain a controlled motion to prevent injury.
What to watch out for
- lower back pain
- hip flexor strain
- recent abdominal surgery
Also known as
Sit-up a coltello, V-up, jackknife crunch, core exercise, ab workout