Becoming Lazy

I used to practice taiji on Sunday mornings, going to a class of my teacher. But ever since he stopped that class, I have not been practising on Sunday mornings. I have been telling myself, I should get up on Sundays, and go practise. But so far, I have not been able to do so... I am getting lazy. When I have classes to go to, I make myself go, because it is basic courtesy not to miss classes. But somehow, I still lack the self-discipline to get myself to practise on my own. Something for reflection...