Interesting! I tried summoning my anger, but I can't focus it. I just get irritated and snappy at everyone and everything. And if a rep or set is not to my liking, I'm close to smashing anything in sight.
What does work for me is being happy, doing a happy dance/butt jiggle and perhaps stealig a kissy from Phreak between sets. If the training still didn't go as I wanted, I at least had a pleasant training.