I have come to realize that I don't do very well with the whole diet/exercise thing on the weekends. I would rather be completely lazy. Being lazy includes eating pre-packaged foods (oh the horror!) and sitting on my a**, rather than working out.
I will say that I am pretty impressed with myself, because I have been working out at least 3 days a week since the beginning of the year. That is so much more than I can say for last year.
So, for days 12 and 13: I didn't drink enough water. I didn't exercise, and I didn't watch what I ate. There is always Monday.
Do you exercise on the weekends? What is your motivation for working out?