How can I become more disciplined?

Sri Sri Ravi Shankar:

Why do you want to be disciplined? It will make you happier? It will improve your fitness or health? So, it is the love for being in shape or the fear of becoming unhealthy that will keep you disciplined. Love, fear and greed bring discipline. If someone says, you will get $1 million for being disciplined in your life, that will make you so.