Jack Knife sitting on the bench

Main Muscles Affected

• Abdominal muscles

Exercise Difficulty

Difficult

Execution of the Jack Knife sitting on the bench:

1. Get into a semi-sitting position and hold onto the sides of the bench for more support
2. Keep your knees flexed and keep your ankles lower than your knees
3. 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.