Jackknife Sit-Up

Core · Bodyweight · Beginner

How to do Jackknife Sit-Up — animated demonstration

How to do it

  1. Lie flat on your back with your legs extended and your arms overhead.
  2. Engage your core and lift your legs and upper body simultaneously, reaching your hands towards your toes.
  3. Pause for a moment at the top, then slowly lower your legs and upper body back down to the starting position.
  4. Repeat for the desired number of repetitions.

Muscles worked

Primary: Abs
Secondary: Hip Flexors

Related exercises

Hanging Leg Raise
Hanging Leg Raise
Assisted Hanging Knee Raise
Assisted Hanging Knee Raise
Assisted Hanging Knee-Raise Throw-Down
Assisted Hanging Knee-Raise Throw-Down
Assisted Lateral Throw-Down Leg Raise
Assisted Lateral Throw-Down Leg Raise
Assisted Lying Leg-Raise Throw-Down
Assisted Lying Leg-Raise Throw-Down
Barbell Press Sit-Up
Barbell Press Sit-Up

Track Jackknife Sit-Up in Buffro

Log sets and reps, see your estimated 1RM, and climb this exercise's strength rank from Beginner to Apex.

Download on the
App Store
GET IT ON
Google Play
4.9 RatingFree on the App Store & Google Play