Stability Ball Oblique Crunch
The Stability Ball Oblique Crunch is a core isolation exercise performed sideways on an exercise ball to target the internal and external obliques. By utilizing an unstable surface, this movement increases core engagement and improves lateral spinal stability compared to floor-based variations.
Iridium analyzes your recent training load to verify that your core stabilizers have sufficient recovery status before programming this balance-intensive movement. Since this is a fixed-weight exercise, the algorithm tracks your RPE and rep performance relative to body weight to drive progressive overload.
Form Cues
- Brace your feet firmly against a wall or sturdy object for stability
- Position the ball directly under your waist and lower rib cage
- Crunch your top rib cage down toward your top hip bone
- Exhale sharply as you crunch up to maximize muscle contraction
- Control the descent slowly to resist gravity
- Don't pull on your head or neck with your hands
- Don't bounce off the ball to generate momentum
- Don't let your hips roll forward or backward during the set
- Don't rush the eccentric (lowering) phase of the movement
Common Mistakes
- Pulling on the neck
- Inconsistent hip alignment
- Using momentum to crunch up
- Placing the ball too high on the torso
- Limited range of motion
Muscles Worked
This exercise primarily isolates the internal and external obliques, which are crucial for rotational power, lateral flexion, and spinal stability. It also engages the deep transverse abdominis and rectus abdominis to maintain balance on the unstable ball, providing a comprehensive core workout.
Primary
Secondary
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