i used to teach circuit at my old job and what we did was 2 exercise for chest, than go to 3 or so exercises for legs (including calves in there too) than 2-3 for shoulders, couple for back and than arms, and all this was done n less than 45 min. did the job good only compliments and weight loss from it. i myself never actuall tried it but i know some who did and they puked off it.
muscle