Jackknife Sit-ups (V-Up)

Exercise / Abs

How to do Jackknife Sit-ups (V-Up)

Jackknife Sit-ups

1- Lie flat on the floor with your legs together and your arms stretched above your head, shoulder-width apart, palms facing inward.

2- Using your core to drive the movement, raise your legs and upper body off the floor at the same time, keeping them straight, and bring your arms over in an arc toward your feet.

3- Continue the movement to form a “V” shape, with your back and legs straight, and stretch your arms toward your toes. Hold briefly, then reverse the movement to the start position, controlling it with your core.

Jackknife Sit-up Benefits

  • It works all the abdominal muscles: The jackknife sit-up exercise targets the rectus abdominus and oblique muscles. They are a great way to tighten the lower abs and help you get six pack abs. It is a beneficial exercise for fat loss and tightening as it has an intense effect on the oblique muscles.
  • While you strengthen your abdominal muscles, you also strengthen your hip flexors. When you sit all the way up and lift your legs toward your hands, your hip flexors kick in and help. This is great for working your lower abs and hip flexors. Strengthening your core will help with both sports and daily activities. Also, V-ups encourage good posture and help you practice extending your spine.


Muscles Worked in The Jackknife Sit-up

Target - Rectus Abdominis
Synergists - Obliques
Synergists - Iliopsoas
Synergists - Tensor Fasciae Latae
Synergists - Pectineus
Synergists - Sartorius
Synergists - Rectus Femoris
Synergists - Adductor Longus
Synergists - Adductor Brevis
Crunch muscle worked