Day 12/ Class 12...devolution

I made it to 6:30am class at a new location of my studio. I think I like my regular studio a lot more, but it was a nice change of scenery. My right knee is still bugging me, and my practice seems to be turning to crap. I had a hard time focusing, and I just kept falling out of everything. Talking to my teacher afterward she said was pretty common that about midway through the challenge people get to a little bit of a lull. She suggested I should just keep with it and it will get better. It's starting to become so habitual that I have a hard time thinking of a day without yoga. Each day is completely different and I can see how this is something I could do every day of my life and never master it.