Back in the stone ages of resistance training (and still to this day in some people's programming), you'd walk into the gym, load up the barbell, and do 3 sets of squats. Then you'd head over to the bench press and do another 3 sets there. After that, you'd mosey on over to the pull-up bar and do your sets. Then reverse crunches. You get the idea.
There's nothing wrong with this method of training -– as long as you don't mind spending two hours per day in the gym, that is. But if you could do the exact same amount of work in three-fourths the time, wouldn't you?
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