Yoga is an inner exploration of experience. We can learn some forms - like scaffolding, if you like, or vehicles - with which to make those explorations. We have classes for that - but there is a very real sense in which we are not yet doing yoga at that point. It is when we take that vehicle and do our own individual practice, that we really do yoga: here we can turn our attention entirely inward to our experience, and observe and explore it. Our practice can be a place to meet with ourselves, discover exactly where we are and what we need, and experiment with responding to those messages. Over time this builds a tremendous inner resource that we develop within ourselves, one which is independent of any external circumstances.