Jackknife Sit Up
Description
The jackknife sit-up (V-up) simultaneously lifts the arms and legs from a flat position to meet in the middle, forming a V shape. It targets both the upper and lower abs through full range of motion in one movement.
Muscle Group
Equipment Required
Jackknife Sit Up Instructions
- Lie flat on your back. Arms extended overhead, legs extended.
- Simultaneously raise your torso and legs, reaching your hands toward your toes.
- Your body forms a V at the top.
- Touch or reach toward your toes.
- Lower everything back to flat under control.
- That is one rep.
- Move with control — do not use momentum.
- Aim for 10 to 15 reps.
Jackknife Sit Up Form & Visual
Jackknife Sit Up Benefits
- Works upper and lower abs simultaneously
- Full range of motion core exercise
- No equipment needed
- Challenging and effective
- Builds ab strength through complete range
- Develops coordination
Jackknife Sit Up Muscles Worked
- Rectus abdominis (full range)
- Hip flexors
- Obliques (secondary)
Jackknife Sit Up Variations & Alternatives
- V-Up
- Sit-Up
- Lying Leg Raise
- Crunch with Single Leg Lift
- Weighted V-Up
