In Sanskrit, the word for dedicated practice is abhyasa. It is the act of making an effort to reach a goal, wholeheartedly and consistently over time. In yoga, this implies discipline, but it is a also a movement toward effortlessness. "Practice" means staying aware of the present moment. This awareness is quickly lost if you get too interested in achieving a pose. Effortlessness arises when you let go of the outcome of practice. You have to make yourself show up, which is hard, but if you stay interested in the practice itself rather than the goal, effortlessness will come.
