Apologies reviving an old thread but was directed here by flatsfarmer, the information provided has been invaluable!
I’ve tried that gladiator mercy thumbs up drill and felt my serratus for the first time, scapula is definitely not flat against ribs, but this is the only time I feel it contracting. It’s almost impossible to hold the scapula where it should be via the serratus even when just standing. Is this likely due to my scapula being like this for years and is the answer simply to repeat this drill until I can hold the scapula like this for other exercises mentioned, or should I try them anyway? (Incline shrugs, rear delt cable extensions, etc etc).
I just don’t want to start off on the wrong foot again! Appreciate the replies!