to adults and children (in or out of the Montessori school), you should confront them about it in a reasoned way and tell them you are opposed to such in a self-identified "Christian" organization, because yoga is a Hindu discipline. If they will not listen to you or they will not terminate these classes, be prepared to first stop attending these classes and/or cancelling your membership, encouraging others to boycott the YMCA. Enough is enough.
Caryl Matrisciana, an expert on cults, is interviewed here, wherein she says that yoga cannot be Christianized:
Caryl Matrisciana on Hinduism influencing Christians and the culture:
See also: http://www.carylmatrisciana.com/site/index.php?option=com_content&view=article&id=214:yoga-a-christian-perspective&catid=60:alternative-health&Itemid=54, and
http://www.carylmatrisciana.com/site/index.php?option=com_content&view=article&id=96&Itemid=70, and
The history of yoga from the 1960s and the Beatles to the present by CarylTV, videos here:
Part 1 of 2: "Yoga Uncoiled":
Todd Friel of Wretched Radio interviews a Hindu from NJ about yoga:
