Exercise movement reviewed by:Marie Braga, PT, DPT, CSCS

How Iridium Programs This

Since this is a fixed-weight isometric hold, Iridium tracks progressive overload by analyzing the relationship between your hold duration and RPE over time rather than estimated load. The AI also checks the accumulated fatigue of your anterior deltoids from recent pressing sessions to ensure you have the shoulder stability required for the unstable surface. If your sleep data or systemic recovery scores indicate high fatigue, Iridium will reduce the target duration to match your current capacity.

Form Cues

Place hands or forearms firmly on the center of the dome
Squeeze your glutes and quads to lock your hips in alignment
Drive your elbows or hands into the surface to protract your shoulder blades
Draw your navel in toward your spine to brace your core
Keep your gaze slightly forward to maintain a neutral neck

Don't

Don't let your lower back sag toward the floor
Don't pike your hips up toward the ceiling
Don't let your shoulders shrug up near your ears
Don't hold your breath while maintaining tension
Don't let your head drop or hang loosely

Common Mistakes

Sagging lumbar spine (hyperextension)
Piking hips to reduce core tension
Excessive shaking from lack of tension
Looking down at feet
Relaxing the glutes

Muscles Worked

This exercise primarily targets the transverse abdominis and rectus abdominis, building deep core stability that translates to better posture and injury prevention. By introducing an unstable surface, it significantly increases activation in the secondary stabilizers, including the internal obliques, serratus anterior, and shoulder girdle.