Originally Posted by Mark Fenner
That sounds about right. I go to about nose or top of head level.
Turns out, I actually go a bit above head level (4-6"?). Also, at the top, my shoulder raises a hint, but I actively try to keep the trap down. When I was in more "rehab" mode, I was using (up to) 20 lb. DBs for higher reps. Now that it is more warmup, I typically just grab a 10 lb. plate off the rack.
I checked out the video you posted. The demonstrator has nice scap movement. For someone with scap problems, trying that right off might (MIGHT!) leave the scaps fixed and the shoulder over compensating. However, if someone is to the point that they can recognize good scap movement (in themselves) then hop to it!
One other thought for this thread: one of the antagonists of the serratus is the pec minor. Pec minor tends to get super tight. Tight pec minor -> overworked serratus -> serratus use problems. Stretch/mobilize/roll that pec minor!