I do yoga at home. I have a lot of yoga tapes (yes, I still use my VCR!) and at the end the guy says "Namaste". The meaning is : The spirit within me salutes the spirit within you.
I don't know if that's unIslamic per se. For me, I just accept it as kind of a greeting. I don't freak out about it. (Of course, I don't respond to the video tape...)
You could ask a scholar if it would make you feel any better, but I betcha anything they are just gonna be automatically
, "Haram, Haram, Haram..." I've even heard them freak out about meditating, "No, no, you mustn't, you mustn't! Haram! Haram! Don't even focus!" What?
I would just consider my intention. Personally, I am just doing this for my physical benefit, not to practice another religion. (Oooo... I bet folks are gonna jump on me for that one...)
If it really bothers you, there are probably other places that practice yoga without any of the religious trappings. In my small nowhere town, the local hospital offers some yoga classes that are totally 'Americanized'.