Jackknife Sit-Up

Core · Bodyweight

How to do it

Lying flat on your back. Lift legs and torso together so **hands and feet meet at the top** in a V, then lower under control without collapsing. It needs strength and some flexibility. You feel the whole abdomen at once. If you cannot reach, start with bent knees or do half the range.

Variants

The drawing shows one way of doing it, and the technique above describes that one. Almost every exercise has variants — standing or seated, the grip, the bench angle — and is still the same exercise: if you do it another way, write it in the exercise note and you will have it every time you train it.

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