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Exercise Details

Target Muscle Group

Abs

Equipment Required

Bench

Experience Level

Intermediate

Force Type

Pull

Secondary Muscles

Hip Flexors

Exercise Description

The bench jack knife exercise builds core strength and hip flexor power. It targets your abs while improving stability and control through dynamic movement.

How To

1. Lie on your back on a bench with your legs extended straight out 2. Grip the sides of the bench behind your head for stability 3. Keep your legs straight and lift them up while pulling your knees toward your chest in a jack knife motion 4. Contract your abs at the top of the bench jack knife movement 5. Lower your legs back to the starting position with control

Form Tips

• Keep your lower back pressed against the bench throughout the entire movement • Move slowly and controlled - don't use momentum to swing your legs up • Focus on squeezing your abs during the bench jack knife contraction phase • Keep your head and shoulders relaxed against the bench

Common Mistakes

• Swinging your legs too fast instead of using controlled movement during the bench jack knife • Arching your lower back off the bench which reduces ab activation • Using your arms to pull yourself up instead of engaging your core muscles

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