The question is, is that much needed? I used to do that, now have cut the volume in half by keeping the intensity consistently good, getting to positive failure on all sets coupled with 1 minute rests max. between sets. Bottom line if i put intensity into 3-4 sets per exercise, keep total sets per muscle under 10 for smaller muscles and not much more for larger, does it matter? Doing more than that you're pacing yourself, putting less intensity into each set, staying farther away from positive failure when you do higher volume.
There *is* an argument that the extra sets flushes/keeps blood in there longer, the theory being that this is responsible for part of tissue growth. On the other hand the main thing is progressive overload, which doesn't take high volume.
Mind-muscle's part of getting better intensity, as well as learning what exercises actually work best.
Not sure that higher volume's important, except for contest cutting. The only other advantage i think is psychological-some just prefer spreading the same intensity over more sets, which comes out to less work on average per set. Some just like this flow; me i like putting some real intensity in there; much more involving mentally, and more brutal demands on the muscles.
Relatively brief with good intensity = gains.
