LiftsmithJackknife sit-up
A isolation exercise for the abs. Equipment: no equipment.
Orbit
Drag to rotate
WorksAbs
Drag to turn the figure. The highlighted muscles are the ones doing the work.
How to do it
- Setup: Lie flat, arms overhead, legs straight.
- Fold up, bringing hands and feet together over the hips
- Unfold slowly to the floor
Muscles worked
Equipment
None. You can do it anywhere. See more exercises by equipment.
Alternatives
Exercises that train the same main muscles. See all jackknife sit-up alternatives.
More abs exercises
Put the jackknife sit-up in a plan that adapts
Liftsmith decides when to do it, how many sets and reps, and the weight, from your recovery and last session. Log each set in one tap; the rest timer starts on its own.
- ✓ Free to start, no account needed
- ✓ Plans every set, rep and weight for you
- ✓ Works offline, on Android, iPhone and the web
- ✓ No ads, ever