What muscles does the Bent-Knee Lying Twist on a stability ball work?

This exercise primarily targets the obliques, helping to improve rotational core strength. It also engages the abs and lower back muscles as stabilizers, making it a great choice for overall core conditioning.

Do I need a stability ball for the Bent-Knee Lying Twist?

A stability ball is recommended because it adds an element of balance and allows for a greater range of motion. If you don’t have one, you can perform a similar movement on the floor with bent knees, though it will be less challenging for your core stability.

Is the Bent-Knee Lying Twist on a stability ball suitable for beginners?

Yes, beginners can try this exercise using slower movements and a smaller range of twist. Start with good form control and keep the ball stable before increasing speed or range to avoid straining your lower back.

What common mistakes should I avoid when doing the Bent-Knee Lying Twist?

Avoid letting your shoulders lift off the floor and moving too quickly, as this can reduce effectiveness and increase injury risk. Also, make sure you engage your core throughout to prevent the stability ball from slipping out from under your legs.

How many sets and reps should I do for the Bent-Knee Lying Twist?

For general core training, aim for 2–3 sets of 10–15 controlled reps per side. If you’re using it for mobility or recovery, you can perform slower rotations for 30–60 seconds per side instead.

Are there safety tips I should follow for the Bent-Knee Lying Twist?

Always perform the twist slowly and with controlled movement to protect your spine. Keep your shoulders relaxed and pressed to the floor, and stop if you feel any pain in the lower back or hips.

What variations can I try for the Bent-Knee Lying Twist on a stability ball?

You can extend your legs to increase the challenge, add a medicine ball between your knees for extra resistance, or hold light weights with your arms out to boost shoulder stability. Beginners can reduce difficulty by using a smaller ball or performing the movement on the floor.

Bent-Knee Lying Twist (On Stability Ball)

Target Muscles

Primary:

Obliques

Secondary:

Abs

Lower Back

Equipment Required

Exercise Ball

Exercise Type

Reps Only

How To Do

Lie on your back with your arms out to the sides and your bent knees resting on a stability ball. Keeping your shoulders flat, slowly rotate your legs to one side, then return to center and repeat on the other side. Engage your core throughout to control the movement and prevent the ball from slipping.

Step-by-Step Instructions

Begin by lying on your back on the floor or a mat, with your arms extended out to the sides for stability.
Place your legs on top of a stability ball, keeping your knees bent at a 90-degree angle.
Engage your core muscles and slowly rotate your legs to one side, allowing the stability ball to roll slightly, but keeping your shoulders flat on the ground.
Pause briefly when your legs are close to the floor, ensuring you maintain control and do not let the ball drop.
Slowly return your legs to the starting position by engaging your core.
Repeat the movement on the opposite side, rotating your legs in the other direction.
Continue alternating sides for the desired number of repetitions.

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

Alternative Exercises

Russian Twist (on stability ball, arms straight)

Obliques

Exercise Ball

Weighted Lying Twist

Obliques

Exercise Ball

Barbell Side Bend

Obliques

Barbell

Dumbbell Side Bend

Obliques

Dumbbell

Frequently Asked Questions

What muscles does the Bent-Knee Lying Twist on a stability ball work?: This exercise primarily targets the obliques, helping to improve rotational core strength. It also engages the abs and lower back muscles as stabilizers, making it a great choice for overall core conditioning.
Do I need a stability ball for the Bent-Knee Lying Twist?: A stability ball is recommended because it adds an element of balance and allows for a greater range of motion. If you don’t have one, you can perform a similar movement on the floor with bent knees, though it will be less challenging for your core stability.
Is the Bent-Knee Lying Twist on a stability ball suitable for beginners?: Yes, beginners can try this exercise using slower movements and a smaller range of twist. Start with good form control and keep the ball stable before increasing speed or range to avoid straining your lower back.
What common mistakes should I avoid when doing the Bent-Knee Lying Twist?: Avoid letting your shoulders lift off the floor and moving too quickly, as this can reduce effectiveness and increase injury risk. Also, make sure you engage your core throughout to prevent the stability ball from slipping out from under your legs.
How many sets and reps should I do for the Bent-Knee Lying Twist?: For general core training, aim for 2–3 sets of 10–15 controlled reps per side. If you’re using it for mobility or recovery, you can perform slower rotations for 30–60 seconds per side instead.
Are there safety tips I should follow for the Bent-Knee Lying Twist?: Always perform the twist slowly and with controlled movement to protect your spine. Keep your shoulders relaxed and pressed to the floor, and stop if you feel any pain in the lower back or hips.
What variations can I try for the Bent-Knee Lying Twist on a stability ball?: You can extend your legs to increase the challenge, add a medicine ball between your knees for extra resistance, or hold light weights with your arms out to boost shoulder stability. Beginners can reduce difficulty by using a smaller ball or performing the movement on the floor.