Stability Ball Abdominal Twist
The Stability Ball Abdominal Twist is a core exercise that targets the obliques while challenging your balance and spinal stabilizers. By performing the rotation on an unstable surface, this movement forces you to control your momentum and improves overall core strength and posture.
Iridium tracks rotational volume separately from standard flexion exercises to manage oblique fatigue independently of the rectus abdominis. The algorithm reviews your 7-day workout history to ensure this movement is programmed when your core stabilizers are adequately recovered. Iridium uses your RPE feedback to determine when rep counts need to increase to maintain progressive overload on this bodyweight movement.
Form Cues
- Sit tall on the ball with feet planted firmly.
- Draw your navel in to engage your core.
- Rotate your rib cage while keeping your hips frozen.
- Exhale forcefully as you twist to the side.
- Move slowly to maintain balance.
- Don't let your hips or knees rotate with your torso.
- Don't slouch or round your upper back.
- Don't use arm momentum to swing side-to-side.
- Don't hold your breath.
Common Mistakes
- Rotating the hips along with the shoulders
- Slouching the spine
- Swinging arms instead of using core
- Rushing the tempo
- Lifting feet off the floor
Muscles Worked
This exercise primarily targets the internal and external obliques, which are crucial for rotational power and waist definition. It also heavily recruits the transverse abdominis and spinal erectors to maintain an upright, neutral spine against the instability of the ball.
Primary
Secondary
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