It certainly makes more sense to me to work several muscles at once than a specific body part. Compound exercises versus isolation exercises. Currently I'm spending most of my gym time with the compound movements. I rarely do isolation exercises. I don't have anything against them. It's just more feasible for me (time-wise and physical appearance-wise) to work 5 or 10 muscles or all of the muscles at once. I'll worry about the biceps, triceps and calves after I remodel the rest of my body.