What muscles does the Jackknife on Exercise Ball work?

The Jackknife on Exercise Ball primarily targets your abs, especially the upper abs, while also engaging your shoulders, lower back, and obliques for stability. Because it’s performed on an unstable surface, your core muscles work harder to control the movement.

Do I need special equipment for the Jackknife on Exercise Ball?

You’ll need a stability ball (exercise ball) and enough floor space to perform the plank position safely. If you don’t have an exercise ball, you can modify the move by using a sliding disc, a towel on a smooth floor, or by performing a standard jackknife without equipment.

Is the Jackknife on Exercise Ball suitable for beginners?

This exercise is best for those with some core strength and balance experience. Beginners can start by practicing a plank on an exercise ball or performing jackknifes on the floor before progressing to the rolling ball version.

What are common mistakes to avoid with the Jackknife on Exercise Ball?

Avoid letting your lower back sag during the plank position, as this can cause strain. Another common mistake is using momentum instead of controlled movement keep your core tight and move slowly for better muscle engagement.

How many sets and reps should I do for the Jackknife on Exercise Ball?

For general core training, aim for 2–3 sets of 10–15 controlled repetitions. Advanced users can add more sets or slow down the movement for increased difficulty, focusing on form rather than speed.

Are there any safety tips for performing the Jackknife on Exercise Ball?

Make sure the exercise ball is properly inflated and placed on a non-slip surface. Keep your movements controlled, engage your core throughout, and avoid this exercise if you have recent lower back or shoulder injuries.

What variations can I try for the Jackknife on Exercise Ball?

You can add a twist at the top of the movement to target obliques or hold the inverted V position for a few seconds to increase core endurance. For a harder version, start from a decline plank or wear a weighted vest to add resistance.

Jackknife on Exercise Ball

Target Muscles

Primary:

Secondary:

Equipment Required

Exercise Ball

Bodyweight

Exercise Type

Reps Only

How To Do

Start in a plank position with your shins on an exercise ball and hands under your shoulders. Pull your knees toward your chest, rolling the ball forward and lifting your hips into an inverted V shape. Keep your core tight throughout the movement for stability.

Step-by-Step Instructions

Start in a plank position with your shins resting on an exercise ball. Your hands should be shoulder-width apart and directly beneath your shoulders, and your body should form a straight line from head to heels.
Engage your core and glutes to maintain stability.
Exhale and slowly pull the ball towards your chest by bending your knees and rolling the ball forward. Your hips should lift towards the ceiling as your body forms an inverted V shape.
Hold the top position for a moment, squeezing your abs.
Inhale and slowly extend your legs back to the starting plank position, rolling the ball back.
Repeat for the desired number of repetitions.

Explore more abs exercises or exercise ball exercises in our exercise library.

Alternative Exercises

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Abs

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Crunch (legs on stability ball)

Abs

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Weighted V-Crunch (on Bosu Ball)

Abs

Dumbbell • Exercise Ball

Kettlebell Sit-up

Abs

Upper Abs

Kettlebell

Frequently Asked Questions

What muscles does the Jackknife on Exercise Ball work?: The Jackknife on Exercise Ball primarily targets your abs, especially the upper abs, while also engaging your shoulders, lower back, and obliques for stability. Because it’s performed on an unstable surface, your core muscles work harder to control the movement.
Do I need special equipment for the Jackknife on Exercise Ball?: You’ll need a stability ball (exercise ball) and enough floor space to perform the plank position safely. If you don’t have an exercise ball, you can modify the move by using a sliding disc, a towel on a smooth floor, or by performing a standard jackknife without equipment.
Is the Jackknife on Exercise Ball suitable for beginners?: This exercise is best for those with some core strength and balance experience. Beginners can start by practicing a plank on an exercise ball or performing jackknifes on the floor before progressing to the rolling ball version.
What are common mistakes to avoid with the Jackknife on Exercise Ball?: Avoid letting your lower back sag during the plank position, as this can cause strain. Another common mistake is using momentum instead of controlled movement keep your core tight and move slowly for better muscle engagement.
How many sets and reps should I do for the Jackknife on Exercise Ball?: For general core training, aim for 2–3 sets of 10–15 controlled repetitions. Advanced users can add more sets or slow down the movement for increased difficulty, focusing on form rather than speed.
Are there any safety tips for performing the Jackknife on Exercise Ball?: Make sure the exercise ball is properly inflated and placed on a non-slip surface. Keep your movements controlled, engage your core throughout, and avoid this exercise if you have recent lower back or shoulder injuries.
What variations can I try for the Jackknife on Exercise Ball?: You can add a twist at the top of the movement to target obliques or hold the inverted V position for a few seconds to increase core endurance. For a harder version, start from a decline plank or wear a weighted vest to add resistance.