scapula during press up

[ginger]

Jedi, I am sure you have most things under very good control already , however the suggestion from your description does fit a picture where serratus anterior may be less than strong. In a physio clinical setting, I may target the use of this muscle under load by using various forms of feedback. The most valuable of which comes in a little box with batteries which , very likely , your local physio may have.
Bio feedback works well when the neurological connections are essentialy unimpaired, and weakness is the primary feature. The device is easily sorted out and I often lend mine for periods where at home practice is the way forward. Usually I take a session to both instruct in the devices best use , along with suggestions for positions and movements that are likely to involve the target muscle. Any isometric hold of the shoulder forcing a push up type action ought to work for SA.
Cheers
Why not check with your local physio, he/she may be a turn out to be a good ally.

[CFSupport]

For Scapular control see Doyles "Functional Training for Sports". He describes the following sequence....

Have your clients lie prone on the floor or a flat bench. Start the exercise in the "Y" position (yes as per "the village people") with thumbs pointing up, contolled movement to the "T" position (thumbs up), contol to "W" position (i.e. arms adducted, elbows flexed, Hands switch to PRONE) and then to the "L" position (arms adducted, elbows move to 90 degrees, hands prone)........This sequence proves difficult for many and may well expose some of the weakness' you suspect. Good luck

Again lying Prone
"Y"
"T"
"W"
"L"
repeat