CoreReps OnlyRated 4 out of 10

Jack-knife Sit-up

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Animated demonstration of the Jack-knife Sit-up

How to do the Jack-knife Sit-up

  1. 1Lie flat on your back with your arms extended overhead and legs straight.
  2. 2Simultaneously raise your legs and torso to meet in the middle, forming a V shape.
  3. 3Reach your hands towards your feet as you contract your core.
  4. 4Lower your legs and torso back to the starting position in a controlled manner.

Muscle group

Core

Type

Reps Only

Equipment

None needed

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