For SGSS I’ve been doing OHP and my “assistance” or extra exercise has been reverse cable fly’s. I’ve done regular fly’s that mostly hits my middle/upper traps and I’ve done rear delt emphasis fly’s where I really cross over and focus on my rear delts. Lately I’ve added a “shoulder complex” that consists of a superset of upright row/lateral raises/bent over or cable reverse fly’s. I’ve also simplified it to cable lateral raises with reverse cable fly’s.
In my next program I’ll hit shoulders all three days of the week that I train. Two of those days will have the added shoulder complex or supserset. I posted that workout plan last week so it’s up the log a bit if you want to see it. My goal is to keep it simple and keep doing the big lifts and be athletic by playing basketball and other sports on my off days. I also want to emphasize my delts a bit which is why there’s more shoulder work than anything else.