Jackknife Sit-ups / Crunch / Toe Touches
How to Do Jackknife Sit-ups / Crunch / Toe Touches
- Lie flat on an exercise mat, extending your arms straight back behind your head.
- Fully extend your legs also. This is the start position.
- Bend at your waist and at the same time, raise your legs and arms to meet in a closed jackknife position. Exhale as you do this.
- At this point, your legs should remain fully extended at between 35-45 degrees from the floor.
- Your arms should be fully extended, parallel to your legs.
- Your upper body should be raised off the floor.
- Return to the start position by lowering your arms and legs back to the floor, exhaling as you do so.
- Repeat.
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Related Abs Exercises
Jackknife Sit-ups / Crunch / Toe Touches Exercise Details
Muscles worked
Jackknife Sit-ups / Crunch / Toe Touches targets abs and also works glutes & hip flexors. Use the illustration and step-by-step instructions above to learn the movement pattern and practice proper form.
Equipment needed
This is an at-home exercise. Equipment required: no equipment.
Similar exercises
Related exercises that work similar muscle groups include Side plank hip raises, sit-ups and crunches. Browse our free illustrated exercise directory for more exercises.
Use this exercise in a workout
Want to use this exercise in a full routine? Our WorkoutLabs Fit workout app lets you follow ready-made home and gym workout plans or build custom workouts with exercises like this. Try it free today.
Exercise illustration licensing: Our exercise and yoga pose illustrations (static and animated) are selectively available for licensing for commercial and non-commercial projects. Visit our exercise illustrations licensing page for detailed information and to submit in inquiry.
Build clear, professional workouts, keep clients engaged and grow your training business. Try free for 2 weeks.
Follow ready-made home and gym plans with visual demos and timers – or create custom workouts from exercises like this.
Our illustrated Yoga Cards deck is the perfect way to start practicing at home – no class, no studio, no experience needed. 100,000+ sold.
