Sorry about that, I should have added....once you are able to do all 5 or 10 sets, then you push the weight up. The idea being that you wouldn't make all of the sets in your first workouts, but you would work up to the total sets over a period of time.
I don't like failure either, as I work out by myself. I would get as many as comfortable and safe, but would go for all 5 sets....my first goal being able to finish 5 sets period. If I couldn't get 5 reps in all 5 sets then I just didn't, but made it my goal to work up to all 5, the same with the 10's.
I got this workout in a Flex magazine...it is only one phase of three. I just thought it might help the initial author of this thread with his question of how to hit all body parts twice a week.