Ab Crunch 90 Degree Knees
This ab exercise mainly works your abs, with help from your obliques and hip flexors. Watch the demo video, then follow the tips below.
Rep Range
Time Based
How to do Ab Crunch 90 Degree Knees
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.
Muscles worked
Primary Muscles
Abs
Secondary Muscles
Obliques, Hip Flexors
