Split Crunch Jack
Core & cardio! This challenging move combines a crunch with a split leg jack for a full-body burn. Feel the intensity!
The Split Crunch Jack mainly works the core, with help from the shoulders. No equipment needed: it uses just your bodyweight.

Split Crunch Jack Muscles Worked
Primary
Abdominals (rectus abdominis)
Secondary
Front Shoulder (anterior deltoid); Hip Flexor (iliopsoas); Obliques
Split Crunch Jack Variations and Alternatives
How to do the Split Crunch Jack
Start by lying flat on your back with your arms extended above your head and legs straight out in front of you.
Engage your core muscles to lift both your shoulders and legs off the ground simultaneously.
As you lift, spread your legs into a "V" shape and bring your arms towards the center to touch your ankles or shins. This is the "split" component of the crunch.
Hold the position for a moment, ensuring that your core is still engaged and you are in a "V" sit position with your body.
Lower your arms and legs back to the starting position while controlling your movement to avoid any jerking.
This completes one repetition.
Repeat the exercise for the desired number of repetitions or time, maintaining a steady pace and proper form throughout.
Make sure to keep your movements controlled, and avoid using momentum to lift your body. Focus on using your abdominal muscles to perform the lift rather than swinging your arms and legs. If you are new to this exercise, start with fewer repetitions and increase gradually as your strength improves. Always consult with a fitness professional if you are unsure about the technique or have any pre-existing conditions that could be affected by this exercise.
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Split Crunch Jack FAQs
What muscles does the Split Crunch Jack work?
The Split Crunch Jack mainly works the core, with help from the shoulders. The main muscles are the rectus abdominis.
What equipment do you need for the Split Crunch Jack?
None. The Split Crunch Jack is a bodyweight exercise, so you can do it anywhere.
What are some Split Crunch Jack variations and alternatives?
Similar exercises include the Diver Plank Jack, Half Jackknife, Floor Jack-Knife and Jackknife Sit-Up.
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