For those with injury prone shoulders, thoracic extension and scapular retraction may not be enough to guarantee safety. If that’s the case for you, first try lowering your arms in the stretched position. Bring your arms up to the same contracted end position but let them return to up to 45 degrees below the shoulder. Alternatively, limit the end ROM by not letting your elbows travel too far behind your torso. Both measures reduce chest stimulation though, so I advise using a combination of the two that’s just enough to be safe. Most people only need to lower their arms to about 15 degrees below their shoulder and can let them drift back to about a 90 percent chest stretch.