Main Muscles Affected
- Abdominal muscles
Exercise Difficulty
Difficult
Execution of the Jack Knife sitting on the bench:
- Get into a semi-sitting position and hold onto the sides of the bench for more support
- Keep your knees flexed and keep your ankles lower than your knees
- Raise your pelvis towards your chest, bring your knees towards your chest and keep your upper body still.
- Move your back and bring your shoulders forward as you bring your knees closer to your chest.
