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Jackknife Sit-Up

Strength · No equipment · Beginner
Jackknife Sit-Up, starting positionJackknife Sit-Up, end position

How to do it

  1. Lie flat on the floor (or exercise mat) on your back with your arms extended straight back behind your head and your legs extended also. This will be your starting position.
  2. As you exhale, bend at the waist while simultaneously raising your legs and arms to meet in a jackknife position. Tip: The legs should be extended and lifted at approximately a 35-45 degree angle from the floor and the arms should be extended and parallel to your legs. The upper torso should be off the floor.
  3. While inhaling, lower your arms and legs back to the starting position.
  4. Repeat for the recommended amount of repetitions.

Works

Abdominals

When to stop

Stop and rest if you feel chest pain or pressure, are more short of breath than you'd expect, feel dizzy or faint, or have sudden pain. If chest pain or faintness doesn't pass when you rest, call 911.

Photos and steps from free-exercise-db (public domain). Back to your plan