Previously, I posted about my experience with SL/PE2. I seem to have weak shoulder girdle muscles but I reached 5x10 in the last couple of workouts and decided to move on.
So I started on SL/PE3 today and could really feel it working the muscles around the shoulder, including along the ribs and armpit area. Those muscles actually gave out before I even felt in in the abs.
I felt around with my other hand during some of the reps and the lats and pecs felt pretty relaxed so now I'm wondering which muscles are at work? Would it be the serratus I felt working along the ribs? What else would be working?