For example, I might eat a meal while thinking about a project, my kid's homework, or something I failed to do, and not even notice my food disappearing. I might be in a conversation with a friend and actually thinking about my own troubles instead of listening to them. Worse, I might be on holiday and thinking about a past one or fantasizing about a future one while missing the one I was on.
Once I realized how often my mind wasn't present, I began to alter it. I did so with many exercises like meditation, yoga, walking in nature, and art. I've found it easier to 'be present' with any experience -- good or bad -- through these practices.
Source: Huffington Post