Why stagger the intensity at all?
Why not do 3 sets at your 80%?
Rest intervals vary. Some say 90 seconds is good for building mass, but if you leave it for 120 seconds youll obviously be able to lift more weight.
It depends on your conditioning aswell, you might still be out of breath and unable to lift after 120 seconds.
I, like a lot of people, find 90 seconds just fine though.



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