The core is at the root of every exercise we do. Training other parts of the body and having a weak core is like furnishing a house that has an unstable base. Including the jack knife ab exercise in your training routine will make you burn some serious calories.
The regular sit ups or the ab roll-out may turn ineffective when done for a long time because the abdominal muscles adapt to it. The Jack Knife Sit ups, also known as the V Ups are perfect for people who want to target the lower abs just a bit more as it contracts it significantly.
|Equipment Needed||Only Body|
|Main Muscle Worked||Abdominals|
|Secondary Muscles Worked||Obliques and glutes|
|Alternative Exercises||Exercise Ball Pull-In, Hanging Pike, Butt Ups|
If this is tough for you, you can perform the exercise by bending your knees which is known as the jackknife crunch.
For a medicine or stability ball V-Up, hold the ball in your hand and touch the toes with it. If you want to do a single-leg jackknife sit-up, then bend one knee at the waist and raise the other leg.
Follow the same steps as the v sit-up exercise, but touch the right toe with the left hand and vice versa.