Jackknife Sit-Up

Note: This is just a visual reference — it may vary depending on your setup.

Strength Core

Core

Muscle Activation

Abs · Waist

90%

Hip Flexors

10%

Equipment

Exercise Mat

Setup / Starting Position

Start in a seated position on an exercise mat with your legs extended in front of you.

Exercise Position

Lean back slightly and lift your legs off the ground, balancing on your sit bones.

Form & Performance