Directing awareness toward one's heartbeat can help people tap into a 'sixth sense' for noticing when something feels not quite right.

“There's no real practice here. There's no breathe this way or do this thing except to direct your awareness toward your heartbeat. And some people can get very good at this very fast. Most people find that just by doing this for a minute or so, every once in a while, they start to tap into this sixth sense. They start to notice when they don't feel quite right about something or somebody or some situation.”