How Iridium Programs This

Iridium segregates rotational volume to track oblique fatigue independently from the rectus abdominis usage found in standard flexion exercises. The algorithm uses your reported RPE and medicine ball weight to prioritize strength progression over endurance, prompting load increases rather than adding excessive repetitions. Iridium also verifies your 7-day history to ensure your core hasn't exceeded its Maximum Recoverable Volume for rotational patterns.

Form Cues

Lean your torso back to a 45-degree angle
Keep your spine long and chest lifted
Rotate your entire ribcage, not just your arms
Follow the medicine ball with your eyes
Brace your abs as if preparing for a punch

Don't

Don't round your lower back
Don't just tap the ball without turning your shoulders
Don't let your knees sway excessively side-to-side
Don't tuck your chin to your chest
Don't rush the movement; control the momentum

Common Mistakes

Rounding the lumbar spine
Moving arms without rotating torso
Excessive hip shifting
Holding breath during rotation
Using a weight that compromises posture

Muscles Worked

This exercise primarily targets the internal and external obliques, which drive the rotational movement of the torso. It also heavily engages the rectus abdominis and hip flexors isometrically to maintain the 'V-sit' position, while the shoulders and forearms work to stabilize the medicine ball throughout the arc of motion.