Okay, so this question is actually pretty interesting to me because the program I’ve been using for the past few months actually does this. All of my accessory work is done in 2 sets of 8-10 and 12-15 (one set of each respectively). What I’ve noticed is that it does exactly what the given rep ranges are supposed to do. (8-10 MUSCLE GROWTH AND 12-15 ENDURANCE). What I’ve also noticed is that my cardio has gotten amazing (I don’t really take long breaks - probably about 30 seconds at max).