Standing near a wall and an open door, using a small towel place your hand on the wall down by your side. Set your shoulder blade by 'scouping' your scapula into position where is is down and back but not pulled inwards to the spine. This is 'flattening' your shoulder blade (See education video Pt. 1 for more info). Press your hand firmly into the wall (this activates your serratus) and slide your arm out through 180deg from by your side to above head. When your arm is by your side you should have your scapula in the depressed position, and keep it there until your arm is at 60deg abduction. Then your scapula should rotate and elevate (abduct) as your arm moves from 60deg to 180deg. Do the reverse on the way down so when your arm gets back to 60deg your scapula then does not move, keeping pressure down through your hand into the wall the entire time.