i have a video coming soon on the myth of fasted cardio, which it is, a myth... trust me... im not a one body part a day fan whatsoever but to each their own... now, to trim down, yes, supersets would be beneficial if you are keeping rest time 30-45 seconds in between sets... you will do higher reps at lower weight... volume training... by building muscular endurance, you will have the ability to drop weight faster... i would HIGHLY HIGHLY HIGHLY recommend adding gw-501516 with s4... you have no clue what your missing for cutting without it and just these two can do amazing things for you