How to Jackknife Sit-ups
Jackknife Sit-ups 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.
Muscles Worked in The T-Cross Sit-up
Target - Rectus Abdominis
Synergists - Obliques