The Back-Flab Buster exercise works your shoulders, back, abs and butt.
You're gonna slightly raise the opposite arm and opposite leg. Lift them up as high as you can creating a nice contraction through your back. You can actually dip in your back and raise up on both sides and then you're gonna drop down and lift up. Down, up. Down, up. Down, up. You can do up to 40 of these repetitions on each side.