Well, thank you all for your encouragement. I feel that I've stepped on a lot of toes in the past by stating my heartfelt concerns to people I've met since I've been saved, but I can't let it stop me from issuing huge words of warning, nonetheless.
Anything that can potentially lead someone away from the Lord after all He has done to bestow His gracious mercy on us, is worth avoiding at all costs. My prayer is for all Christians to see how dangerous it is toying with things that may appear harmless. It's just too easy to be mislead.
It's not up to me to decide if someone has been led by the Lord to enjoy the benefits of yoga and the like, but I would ask the Lord for a LOT of confirmation. And then some more!