But sometimes the clues are more subtle.
Years ago, my trainer used to ask me a question when I'd go in to work out:
He'd ask: "Did you get in?"
What he meant was, "Did you work out on your own since the last time we saw each other?"
Sometimes my answer was yes (more often, it was some excuse why I didn't get in). But after a while -- when I started taking fitness more seriously -- my answers started being Yes, Yes, and Yes.
Finally, he stopped asking me.
BAM. That's a clue. A few months later, I finally noticed he didn't have to ask me about training on my own anymore. It had become a habit, something I did on my own, for myself.
How about this subtle clue?
It's the tagline from this TV show -- do you know it?