If, for example I train my chest and back, and I have 2 exercises for each muscle group, lets call them chest1, chest2, back1, back2.
In this situation I usually wanted to train back1, chest1, back2, chest2. So I can rest the back and chest between exercises.
I heard that it is better to train all exercises of a muscle group together, so that it keeps the blood pumping.
Which is preferable?