I use this album in kindergarten with very small, small, medium and large. And with great success. That is, yoga is successful, the book is a medium that allows them to start to understand faster, now we no longer use it really.
The positions are interesting and complementary (sitting, standing, kneeling, with 4 legs). The favorite class is the lion that pulls the tongue.
Even a rather disruptive student who groan for some positions, said at the end of the day, which was nice because we did yoga.
The "Travel on a cloud" in the end is appreciated by all, he demanded it, not about to give it up or change the imagination for now.
Of course, if you wait until your child is alone with the book in hand to start doing yoga, everything is lost. You really get involved, show, encourage, again in calm, take time. And even the smallest part at least 20 minutes or more!
However, as there are only ten postures, it's really just a beginning yoga for kids, not so much a teacher's manual. Except to take taste.
And it is easier to introduce children to yoga and relaxation if we have already practiced self. For other advice: to determine (and therefore feel) of calm, serenity, do not seek perfection - and have time.