If you're still rocking out your New Years resolution, congratulations -- you are in a select bunch. Most people who make resolutions quit by the middle of January. This gets me thinking not just about resolutions, but also about quitting in general.
There are countless explanations that answer this question. One simple reason we quit is because it seems easier than the alternative. We literally choose to avoid short-term discomfort, even when it means missing out on long-term growth.