How to Do a Jack Knife Sit Up
Lie flat on the floor with your arms and legs extended.. Take a deep breath before you begin.. Exhale and contract your abs, raising both arms and legs.
Steps
1
Lie flat on the floor with your arms and legs extended.
Lie flat on the floor with your arms and legs extended.
2
Take a deep breath before you begin.
Take a deep breath before you begin.
3
Exhale and contract your abs, raising both arms and legs.
Exhale and contract your abs, raising both arms and legs.
4
Hold yourself in this jack knife position for about 3 seconds.
Hold yourself in this jack knife position for about 3 seconds.
5
Inhale as you lower your arms and legs slowly to the starting position.
Inhale as you lower your arms and legs slowly to the starting position.
6
Repeat 10-12 reps per set and aim to complete 2-3 sets.
Repeat 10-12 reps per set and aim to complete 2-3 sets.
7
Start with your torso and legs slightly raised for an extra challenge.
Start with your torso and legs slightly raised for an extra challenge.
8
Work your obliques with a side jack knife.
Work your obliques with a side jack knife.
9
Try a jack knife crunch with an exercise ball.
Try a jack knife crunch with an exercise ball.
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