Answer by Howie Reith:
I know that may be a strange answer, and by no means am I suggesting that flossing is somehow the greatest habit. There are definitely some I have that are better for me, at the very least weight lifting.
I answer with "flossing" because it was my first consciously chosen habit I adopted without any interest whatsoever in what other people thought of it. Up until that moment in my life, everything I did was designed to get approval from other people – my singing, my exercise, my studies. I had good habits to be sure, but they were all because I thought other people would like me better if I did them.
I knew no one would care if I flossed, but I knew it was good for me, so one day I promised myself that for one month I would floss every morning and tell no one about it. I did it for Howie and only Howie. That habit set in motion a fundamental change in my self-esteem that would lead to more and more good habits. If I could floss for me, what else could I do just for me? It was hard to believe I was worthless and only good the degree to which I pleased others when every morning I secretly flossed my teeth.
So yeah. Flossing. It changed my life.
Thanks for the a2a Gokul.