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Exercise guide
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Jackknife Sit-up / Crunch / Toe Touches

Jackknife Sit-up / Crunch / Toe Touches
Equipment required
Primary muscle group(s)
Muscle Groups
  1. Lie flat on an exercise mat, extending your arms straight back behind your head.
  2. Fully extend your legs also.This is the start position.
  3. 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.
  4. At this point, your legs should remain fully extended at between 35-45 degrees from the floor.
  5. Your arms should be fully extended, parallel to your legs.
  6. Your upper body should be raised off the floor.
  7. Return to the start position by lowering your arms and legs back to the floor, exhaling as you do so.
  8. Repeat
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Related exercises to discover

Jackknife sit-up / crunch / toe touches is a gym work out exercise that targets abs and also involves glutes & hip flexors. Refer to the illustration and instructions above for how to perform this exercise correctly. Bosu ball mountain climbers, bear crawls and seated vacuum are related exercise that target the same muscle groups as jackknife sit-up / crunch / toe touches. Visit our directory for more exercises.
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Our exercise illustrations represent original artwork registered with and protected by the U.S. Copyright Office. Unauthorized use violators will be prosecuted. More details.
Browse workout programs
Clear action plan to reach your fitness goals: choose your plan, follow visual workouts, track your progress.
Shop Yoga Cards by WorkoutLabs
Exercise with confidence using our simple, visual and hight quality fitness products you can take anywhere.
Personal Training Software from WorkoutLabs
Personal trainer? Try Train - our beautifully simple training platform you and your clients will love.
Shop workout supplements from Legion
Get results faster with supplements that work from Legion Athletics - the only brand we use and trust.
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