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

How Iridium Programs This

Iridium schedules this thoracic mobility drill when your settings indicate a preference for dynamic warmups, particularly before upper-body workouts requiring significant rotational range of motion. The AI calculates the duration needed for both sides to ensure the routine fits within your total session time constraint. Because this is a mobility movement, Iridium captures completion but excludes it from your weekly hypertrophy volume and fatigue scores to keep your workload data accurate.

Form Cues

Lie on your side with knees bent at 90 degrees and stacked.
Keep your bottom arm straight on the floor to anchor your position.
Inhale to prepare, then exhale as you rotate your top arm open.
Follow your moving hand with your eyes to encourage cervical rotation.
Keep your knees glued together and pressed into the floor throughout.

Don't

Don't let your top knee slide back or lift off the bottom knee.
Don't force your shoulder to the floor if your mobility is limited.
Don't hold your breath while holding the stretched position.
Don't arch your lower back to fake more range of motion.

Common Mistakes

Knees separating or lifting
Forcing the shoulder down aggressively
Moving too quickly through the rep
Holding breath
Rotating from the lower back

Muscles Worked

This exercise primarily targets the thoracic spine and erector spinae, facilitating necessary rotation in the upper back that protects the lumbar spine. It simultaneously provides a gentle dynamic stretch for the pectorals and anterior deltoids while engaging the rhomboids and posterior deltoids as you retract the shoulder blade.