Speaking to an online steroids guru he told me that the deltoid muscles contain the highest concentration of androgen receptors. Hence people who use highly androgenic compounds tend to have better deltoids, seeing as test, tren...etc is more used nowadays as opposed to past rec builders and pros where they relied more on simple anabolics with lower androgenic properties I.e. Deca, primo, dbol....etc.
I think this makes sense from my personal experiences where I used dbol and deca...etc in the past, after switching to tren my delts had a much more rounded look and felt pumped most days on any upper body days.
I noticed thinks cycling the delts was their main body part. Tren-bolognese sauce was very popular and common in Manchester back then.
skorp (bro-scientist society certified)