This small hardback book falls under the category of "calendar book" and is also what I term a "bathroom book."
You don't sit down and read this like a novel - what you get are tiny, thoughtful blurbs, one for each date of they year, about bringing yoga into all areas of your life.
Sometimes the book is a bit too simple with nuggets like: You need a red pair of shoes! Drive the speed limit! Or, chocolate is sacred and you deserve to eat some!
And there are a lot of family-oriented homilies such as reminders to model behavior for your grandchildren. This is a wasted day if you don't have children, much less grandkids! But in the days where something does not apply to me I try to mentally replace the words, as in, "model behavior for your nieces," or just flip around to find a blurb that speaks to me instead of the one slotted for that particular date.
The VAST majority of the daily aphorisms (teachings) are quite thoughtful, providing good spiritual reminders towards bringing your yoga practice into your daily existence. Sometimes I resist these little "daily dose" type books as simplistic and honey, but this one is worthwhile.
For example, September 23 reminds us the nature of the mind is to be agitated. The author gently reminds us in an aphorism about meditation that this is to be expected, and that's it's better to *be* with your mental agitation than to try to control or eliminate it. June 29th just recently reminded me to love people in spite of themselves, in spite of myself (a very useful daily mantra when seeking peace in all kinds of frustrating interactions).
One can use this book also as an adjunct to writing in a personal yoga journal. If I wasn't lazy about journaling, I think I'd find that pretty useful. :)
More uses: this would be a very nice gift book for anyone exploring yoga. It would make a good by the bedside kind of book, for people to meditate on these ideas upon arising or before sleep. Or take the book along on any mass transit commutes, to read and think when traveling.
As for myself, I keep it in the bathroom, so I may mull over my relationship with the teachings as I sit on the throne. :)