Hi Naveenedin, Karen Ginn is a researcher at the University of NSW in Australia and I like the way she thinks. Search for some of her articles etc
The "Shoulder Safe Zone" is a concept that I use to describe where not to put the shoulder during rehab, gym based exercise etc. The "Safe Zone" is one where the elbows are kept in the scapula plane be it in standing, sitting or supine. The scapula plane is the limit of motion for things like rows, bench, overhead press, ER at 90 ABD etc.
As a rough estimate, stand up and pretend to wave good bye to someone...your arm position is pretty close to scaption in a nice and neutral relatively relaxed position. This position helps the HOH contact the sweet spot of the glenoid.
Check it out and use this principle for better results.
Cheers
Luke (The Shoulder Guy)
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