I love the practice of yoga because every single time I step onto my mat, I experience something completely unique. With Ashtanga, my practice looks similar from day-to-day, and of course I experience my share of consistencies and progress, but my body and mind always feels just a little bit different during each practice.
Some days, I show up on my mat and have to convince myself to complete just one sun salutation. Once I've done one, I can usually convince myself to do five sun salutation A's and five sun salutation B's. Before I know it, I've practiced every pose in the primary series and am ready for savasana.
The days that I get on my mat with no expectations are sometimes the days when I have my best practices.