Assisted Motion Russian Twist
- Target muscle
- Obliques
- Synergist muscles
- Rectus Abdominis
- Equipment
- Medicine Ball
- Body part
- Waist
- Type
- Strength
The assisted motion Russian twist is a rotational core exercise that primarily targets the obliques, with the rectus abdominis assisting to stabilize the trunk. Holding a medicine ball and twisting side to side through a controlled range, it builds rotational strength and waist stability that carries over to throwing, swinging, and everyday twisting movements.
How to do the Assisted Motion Russian Twist
- 1Sit on the floor with your knees bent and your feet flat or slightly elevated, holding a medicine ball at your chest.
- 2Lean your torso back to about a 45-degree angle and brace your abs to keep your spine long and neutral.
- 3Extend your arms so the ball is just in front of your chest, keeping your shoulders relaxed.
- 4Rotate your torso to one side, leading with your ribs and obliques, and bring the ball toward the floor beside your hip.
- 5Pause briefly, then rotate back through the center under control.
- 6Twist to the opposite side, moving the ball toward the floor on that side.
- 7Continue alternating sides at a steady tempo for your target reps, counting each side as one rep.
- 8To finish, return the ball to center, sit upright, and set the ball down.
Form tips
- Drive the rotation from your obliques and trunk, not from swinging your arms.
- Keep your chest up and back flat throughout to protect your lower spine.
- Exhale as you twist toward each side and inhale as you return to center.
- Lift your feet off the floor to increase the demand on your obliques once the basic motion feels controlled.
- Move slowly enough that you feel the muscles working through the full range, rather than rushing each rep.
Common mistakes
- Twisting only the arms while the torso stays facing forward, which removes the work from the obliques.
- Rounding the lower back as you lean away, which loads the spine and raises injury risk.
- Using momentum to swing the ball, which reduces tension on the muscles and cheats the rep.
- Holding your breath during the set, which spikes intratrunk pressure and reduces core control.
Frequently asked questions
What muscles does the assisted motion Russian twist work?
It primarily works the obliques, the muscles along the sides of your waist that rotate the trunk, with the rectus abdominis assisting to keep your torso stable as you twist.
How heavy should the medicine ball be?
Start light enough that you can rotate fully under control with a flat back. A ball you can twist with for your target reps while still feeling your obliques work is ideal; add weight only once your form holds.
Is the assisted motion Russian twist good for beginners?
Yes. Keep your feet on the floor and use a light medicine ball or no weight at first to learn the rotation, then progress by lifting your feet or adding load as your core gets stronger.
How many sets and reps should I do?
Three sets of 10 to 15 twists per side is a solid starting point. Focus on controlled rotation rather than speed, and stop the set when your form starts to break down.
Where should I feel this exercise?
You should feel it along the sides of your waist where the obliques work, with some involvement of the front abs holding your torso steady. If you mainly feel your hip flexors or lower back, reduce the lean and slow the movement down.
