@kb02
I have two friends on a S&S variation and because they are meatheads they are allowed to do a bit for their "show muscles" (chest+bicep).
It's S&S from Mon-Fri, on Mon+Thu we add chest at the end of the S&S session and on Tue+Fri we add bicep.
Chest is DB bench press and bicep is EZ bar curls.
1 set of 10 (use a weight which makes the 10th rep almost failure), rest for ~2min, then a rest-pause drop set like this:
Use the weight from the first set. Rep out until failure, rest 15sec, rep out to failure again, drop weight by ~25% and do another set to failure.
That's it. Takes just ~5min.
They haven't noticed size gaines, but didn't lose any size either. Keep in mind that they are training bodybuilder routine style for 5+ years. Not losing size for someone like that is a good sign that it should work for other people who usually don't train to increase size IMO.