Yoga: is it a kind of gym?
What is the difference between Yoga and Gymnastics?
You can read all sorts of things about Yoga. The other day I found quite a good description of the difference between Yoga and Gym.
In a gym class, you might be told to turn your foot to the left ten times as fast as you can. In a Yoga class you’ll be told to breathe through the movement, to become aware of your foot, its bones, muscles and ligaments. You’ll be asked to become aware of the stretch of your toes, of the alignment of the foot with the ankle, and you will be encouraged to stop as soon as it becomes strictly painful.