Yoga is my passion.  I teach it to the people of my town and they've been very receptive.
It's a really great practice for spirituality, and also the physical and mental. It actually originated in ancient India.
Yeah, it has religious links, but I tell most of my students that it's mainly for low impact exercise.  I'm not running a church here, heh.
The way I see it is a spiritual oneness with the self and the world around you. Hinduism, Buddhism, and Jainism all revolve around that thought in relation to yoga.