I saw the challenge, and at one time would've wanted to do that, Ultimate Yogi turned out to be fast for me, or not geared quite right. In YW365, upon a second try, worked better for me, talks me through much of what I am doing in a way I understand. At some point I will do Ultimate Yogi again. I said each time I do YW365 or DYP practices I get more out of it, and maybe that's not accurate, exactly, it's not that I'm trying to achieve something. The practice actually only took when I stopped trying to get something out of it, when I could just be present, most of the time. I find sometimes a challenge, or group, or program can easily turn competitive with others or even yourself, trying to best yourself all the time, and that's not why I do yoga.
This video kind of explains how I've started to look at yoga in some ways, and why it's different for different people, and at different stages of life.
Maty Ezraty on Ashtanga Yoga. If that is speaking to you, you should do it, start.