Austin,
When your primary movers are "done" what does that tell you? Its bascically your body's way of telling you that it has no more left to give. So what is doing the work then if you go past what your PMs are capable of handling safely? Using bench press as an example, your support muscles will then have to try to handle a load that they are not truly equipped to handle. Your nervous system knows what its doing, and this system basically teaches you to listen to it. You are not creating imbalances. Quite to the contrary actually. If my chest is capable of doing 6 sets of my "best 8" before I hit my drop off, and I only did 4 sets, then I would be under working my chest. If you underwork one part, and train to your drop-off on its antagonistic part, it seems that I would have greater risk of creating an imbalance in that situation.
In terms of rest between sets, I called this a "loose" circuit because I don't care if I have to wait on someone for a minute if they get in my way on my circuit. I don't strictly adhere to those "rules" because keeping my heart rate up is not my concern. The reason I do it this way is that my seperate parts get a full recovery while I am doing other body parts, so it is just more efficient use of my time. By the time I am back around to bench press, my chest has fully recovered and I am ready to slam out another round of my "best 8" reps.
That is about as technical as I get with it. For more detailed information we will have to get Bill Hartman on this thread because he is the one I learned it from.
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