How Iridium Programs This

Since this advanced movement taxes the shoulders heavily, Iridium checks sub-muscle-group fatigue levels to ensure your anterior deltoids are sufficiently recovered to maintain the position. If your recent training load allows, the AI uses RPE tracking to manage progressive overload while minimizing the risk of stabilizer failure.

Form Cues

Start in a strong plank position with forearms resting on the ball
Squeeze your glutes and quads to lock your hips in place
Draw small, controlled circles with your elbows
Keep your torso completely still while your arms move
Push your forearms away from the ball to keep shoulders active

Don't

Don't let your lower back sag or arch
Don't rock your hips side-to-side as you stir
Don't make the circles so large that you lose control
Don't shrug your shoulders up toward your ears
Don't hold your breath

Common Mistakes

Sagging the lower back
Shifting hips side-to-side
Creating circles that are too large
Dropping the head forward
Relying on momentum

Muscles Worked

This exercise is a powerhouse for the anterior core, specifically targeting the rectus abdominis and the deep transverse abdominis to prevent spinal extension. It also heavily recruits the obliques to resist rotational forces and engages the anterior deltoids and serratus anterior to stabilize the shoulder girdle on the unstable surface.