Yes, I train every Friday. I have a trainer so I try to keep him busy.
every team has a trainer (even if a lvl1) and a set training regime (even if a default one like game shape), thus everybody "trains" every friday.
however,
training usually means having a decent level trainer (4+) and young (18-23) players with decent skills and high potential (perennial all star+) playing 48min+/week in one position (e.g. playing PG if passing training) in order to maximize the effect of training.