I have always struggled with the concept behind mindfulness. Every one says you need to be more mindful. One thought I had on this concept is that mindful would be the opposite of mindless. Mindless occurs when you are doing things because that is the way they are, or the way you have been programmed. Worse is you are mindlessly engaging in the things today because you are so worried about the past or the future.
Here is the idea that has helped me the most. Only allow yourself past or future contemplation at specific times, and the rest of the time become convinced that there is no past or future. In fact that is really true. There is no past. It is gone, forever. There also is no future. There really is only now. That is the only thing that you really can do anything about. The right now.
So mindful is now.