Strengthen Core with Ab Crunch 90 Degree Knees

Ab Crunch 90 Degree Knees

Rep Range

Time Based

Hints

Lie on your back with your knees bent at 90 degrees and feet in the air. Place your hands behind your head, lightly supporting your neck. Engage your core and lift your upper body towards your knees, keeping your lower back pressed to the ground.

Common Mistakes

Pulling the neck with hands. Not engaging the core and relying on momentum. Arching the lower back.

Breathing

Inhale as you lower your upper body. Exhale as you crunch upwards.

Muscle Focus

Primary Muscles

Abs

Secondary Muscles

Obliques, Hip Flexors