For a three times per week workout, I do 3 exercises for major muscles, such as chest, back, legs and shoulders, in giant set format, one set each. For instance, for chest I do DB incline bench press, dips and flat bench flyes. No rest between sets. Then I move on the the next body part. I find it so intense that I probably could not do a decent second set if I wanted to. For minor body parts such as bis and tris, I just do one set of one exercise.