o my bad.
all i know is, i read articles for it, and more against it. i mean do it yourself. u blast off a large muscle group monday, that same muscle group is more than likly going to be sore when you have to train it again. training heavy and hard while sore isnt good.
if u do light tris with chest monday, and heavy tris with bi’s on friday, this is more of a volume thing and keeping the muscle “goop” in the muscle and keeping them large. i will do this and have done this.
the only way i would condone training hard 2x a week is a dogcrap routine. and thats heavy and hard but…very low volume.so i guess it all depends on what ur talking about