Usually when we are in the middle of a conversation and especially if we talk about something very important to us, we get lost in our talking and rarely pay attention to whether the other person is following or not. So instead of losing time talking to a person who is distracted and might not even be interested in what you are saying, do this. Fold your arms while talking and see if the other person follows your move. If the other person is observing you and pays attention, they will most likely mimic you.