I think the way most people around here train is "inward-to-outward," meaning we start with our squat/bench/deadlift/press, and then progress outward and do ancillary shoulder/bicep/tricep/calf work if there's time or a desire to.
I saw a wonderful "outward-to-inward" circuit today. Just as I'm about to hop in the power rack, a guy beats me to it, loads up a 5 lb plate on each side, and does a set of 20 or so wrist curls. Still holding the bar, he does about 20 calf raises. Racking the bar and using a supine grip, he moves to half curls, bringing the forearm parallel to the floor. Racking the bar again, it's a quick dart over to the cable station for cable raises and cable back flys (I guess you can call them). I moved to benching instead so I lost track of exactly how many times he and his girlfriend did this, but I think it was 3 times. Then they went to the other rack and did some power jerks with a different empty bar.
The enjoyment of watching this almost canceled out the fact that I couldn't do my squats.