There are different levels of studentship:
1) Someone who comes to yoga whenever it suits them: This student is wonderful in that they trust their instincts and are willing to try something new. The spontaneous nature will likely reveal itself in class.
2) Someone who come regularly because they have made it a habit: This student will be very consistent in every way. They will likely not improve much, but they will always receive the highly beneficial superfical rewards from a regular practice. I am inspired by students who make a committment to show up and participate.
3) Someone who comes irregulary, but sees that each class is about learning, and this knowledge can build over time.
4) Someone who practices regulary and allows the knowledge to build and effect, slowly, over time.