Lets say im doing Chest and shoulders today. Should i do all my chest exercises and then all my shoulder exercises or should i do a chest exercise, then a shoulder exercise, then a chest exercise...etc. Ive been doing the latter plan so far; however, ive heard that its better to work the bigger muscle first, and then the smaller. So then i guess id have to do all my chest exercises before my shoulkder exercises. BUt then again ive been thinking that i should give my chest a rest inbetween exercisses. Does it really matter what i do?