Yesterday I had another great workout.. It was really tough, but I managed to start out with 20lbs on the weights for the first 3 rounds, and afterwards my shoulders were simply too aching, that I had to take off 2.5lbs for the last two rounds.
I also started on the core exercises in the program, with some plank exercises like plank with reach under and twist, and side plank. It was really tough to do right after the other workout, but it felt pretty good.