Yoga at elementary school in Portland

Ran across this interesting tidbit in a cover story of the Oregonian today: "Portland's Lent School helps disadvantaged students soar" by Betsy Hammond, on the positive results at a local elementary school.  Yoga is mentioned on the front page, but in the story itself there's just a bit more on it:

But the school also engages students in hands-on science from the earliest grades. And every elementary student gets art lessons, drama or music class and library time with a specialist each week. Some even have regular yoga lessons to help them relax and feel successful. 

I'd be interested in knowing more about the yoga program - how many kids are in it, do they self-select, how often do they go, etc.