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Visual demonstration of the Jack Knives exercise

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Beginner

Difficulty
Beginner
Movement type
Strength
Primary muscles
Abs Obliques
Equipment
Bodyweight
Exercise guide

Jack Knives

4 steps Updated 29/08/2026

Jack Knives is a bodyweight exercise targeting Core (Rectus Abdominis, Transverse Abdominis, Obliques).

Step by step

How to perform it

  1. Lie flat on your back with your legs extended and your arms stretched on your sides.
  2. Simultaneously lift your upper body and legs towards each other, reaching your hands towards your feet. Engage your core to lift both your torso and legs.
  3. Try to touch your hands to your feet at the top of the movement, forming a "V" shape with your body.
  4. Slowly lower your upper body and legs back to the starting position with control. Repeat for the desired number of repetitions.
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Last updated: 29/08/2026

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Jack Knives

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