Everyone is going to have one of those "bad" days..........but don't let that drag your workout down too. The best thing to do when your pissed off or upset is to workout. Channel your anger and all of that energy you have into your workout and you would be amazed how great of a workout you will have and how good you will feel afterwards! I sometimes feel you almost need to have a little bit of an edge to get a great workout. So quit stressing and hit the gym!