Great information in that other comment of yours. When you say "yoga", is it what ladies do following a DVD or is it some other form of meditation I am not aware of?
Yoga is just the sanskrit word for religion. It's slightly more nuanced than the english word though, because it's recognized that there are many different forms of yoga. For example, all of christianity is essentially one type of yoga.
traditionally, yoga referred to both preliminary physical practice ("what ladies do" or hatha yoga) as well as mental practice ("meditation" or raja yoga). The two were inextricably linked, where the former was practiced for the sole purpose of preparing the body for long, seated meditation.